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<h1>adaptmap.c</h1> </div>
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<a href="adaptmap_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*====================================================================*</span>
<a name="l00002"></a>00002 <span class="comment"> - Copyright (C) 2001 Leptonica. All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment"> - This software is distributed in the hope that it will be</span>
<a name="l00004"></a>00004 <span class="comment"> - useful, but with NO WARRANTY OF ANY KIND.</span>
<a name="l00005"></a>00005 <span class="comment"> - No author or distributor accepts responsibility to anyone for the</span>
<a name="l00006"></a>00006 <span class="comment"> - consequences of using this software, or for whether it serves any</span>
<a name="l00007"></a>00007 <span class="comment"> - particular purpose or works at all, unless he or she says so in</span>
<a name="l00008"></a>00008 <span class="comment"> - writing. Everyone is granted permission to copy, modify and</span>
<a name="l00009"></a>00009 <span class="comment"> - redistribute this source code, for commercial or non-commercial</span>
<a name="l00010"></a>00010 <span class="comment"> - purposes, with the following restrictions: (1) the origin of this</span>
<a name="l00011"></a>00011 <span class="comment"> - source code must not be misrepresented; (2) modified versions must</span>
<a name="l00012"></a>00012 <span class="comment"> - be plainly marked as such; and (3) this notice may not be removed</span>
<a name="l00013"></a>00013 <span class="comment"> - or altered from any source or modified source distribution.</span>
<a name="l00014"></a>00014 <span class="comment"> *====================================================================*/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/*</span>
<a name="l00017"></a>00017 <span class="comment"> * adaptmap.c</span>
<a name="l00018"></a>00018 <span class="comment"> * </span>
<a name="l00019"></a>00019 <span class="comment"> * ===================================================================</span>
<a name="l00020"></a>00020 <span class="comment"> * Image binarization algorithms are found in:</span>
<a name="l00021"></a>00021 <span class="comment"> * grayquant.c: standard, simple, general grayscale quantization</span>
<a name="l00022"></a>00022 <span class="comment"> * adaptmap.c: local adaptive; mostly gray-to-gray in preparation</span>
<a name="l00023"></a>00023 <span class="comment"> * for binarization</span>
<a name="l00024"></a>00024 <span class="comment"> * binarize.c: special binarization methods, locally adaptive.</span>
<a name="l00025"></a>00025 <span class="comment"> * ===================================================================</span>
<a name="l00026"></a>00026 <span class="comment"> *</span>
<a name="l00027"></a>00027 <span class="comment"> * Adaptive background normalization (top-level functions)</span>
<a name="l00028"></a>00028 <span class="comment"> * PIX *pixBackgroundNormSimple() 8 and 32 bpp</span>
<a name="l00029"></a>00029 <span class="comment"> * PIX *pixBackgroundNorm() 8 and 32 bpp</span>
<a name="l00030"></a>00030 <span class="comment"> * PIX *pixBackgroundNormMorph() 8 and 32 bpp</span>
<a name="l00031"></a>00031 <span class="comment"> *</span>
<a name="l00032"></a>00032 <span class="comment"> * Arrays of inverted background values for normalization (16 bpp)</span>
<a name="l00033"></a>00033 <span class="comment"> * l_int32 pixBackgroundNormGrayArray() 8 bpp input</span>
<a name="l00034"></a>00034 <span class="comment"> * l_int32 pixBackgroundNormRGBArrays() 32 bpp input</span>
<a name="l00035"></a>00035 <span class="comment"> * l_int32 pixBackgroundNormGrayArrayMorph() 8 bpp input</span>
<a name="l00036"></a>00036 <span class="comment"> * l_int32 pixBackgroundNormRGBArraysMorph() 32 bpp input</span>
<a name="l00037"></a>00037 <span class="comment"> *</span>
<a name="l00038"></a>00038 <span class="comment"> * Measurement of local background</span>
<a name="l00039"></a>00039 <span class="comment"> * l_int32 pixGetBackgroundGrayMap() 8 bpp</span>
<a name="l00040"></a>00040 <span class="comment"> * l_int32 pixGetBackgroundRGBMap() 32 bpp</span>
<a name="l00041"></a>00041 <span class="comment"> * l_int32 pixGetBackgroundGrayMapMorph() 8 bpp</span>
<a name="l00042"></a>00042 <span class="comment"> * l_int32 pixGetBackgroundRGBMapMorph() 32 bpp</span>
<a name="l00043"></a>00043 <span class="comment"> * l_int32 pixFillMapHoles()</span>
<a name="l00044"></a>00044 <span class="comment"> * PIX *pixExtendByReplication() 8 bpp</span>
<a name="l00045"></a>00045 <span class="comment"> * l_int32 pixSmoothConnectedRegions() 8 bpp</span>
<a name="l00046"></a>00046 <span class="comment"> *</span>
<a name="l00047"></a>00047 <span class="comment"> * Measurement of local foreground</span>
<a name="l00048"></a>00048 <span class="comment"> * l_int32 pixGetForegroundGrayMap() 8 bpp</span>
<a name="l00049"></a>00049 <span class="comment"> *</span>
<a name="l00050"></a>00050 <span class="comment"> * Generate inverted background map for each component</span>
<a name="l00051"></a>00051 <span class="comment"> * PIX *pixGetInvBackgroundMap() 16 bpp</span>
<a name="l00052"></a>00052 <span class="comment"> *</span>
<a name="l00053"></a>00053 <span class="comment"> * Apply inverse background map to image</span>
<a name="l00054"></a>00054 <span class="comment"> * PIX *pixApplyInvBackgroundGrayMap() 8 bpp</span>
<a name="l00055"></a>00055 <span class="comment"> * PIX *pixApplyInvBackgroundRGBMap() 32 bpp</span>
<a name="l00056"></a>00056 <span class="comment"> *</span>
<a name="l00057"></a>00057 <span class="comment"> * Apply variable map</span>
<a name="l00058"></a>00058 <span class="comment"> * PIX *pixApplyVariableGrayMap() 8 bpp</span>
<a name="l00059"></a>00059 <span class="comment"> *</span>
<a name="l00060"></a>00060 <span class="comment"> * Non-adaptive (global) mapping</span>
<a name="l00061"></a>00061 <span class="comment"> * PIX *pixGlobalNormRGB() 32 bpp or cmapped</span>
<a name="l00062"></a>00062 <span class="comment"> * PIX *pixGlobalNormNoSatRGB() 32 bpp</span>
<a name="l00063"></a>00063 <span class="comment"> *</span>
<a name="l00064"></a>00064 <span class="comment"> * Adaptive threshold spread normalization</span>
<a name="l00065"></a>00065 <span class="comment"> * l_int32 pixThresholdSpreadNorm() 8 bpp</span>
<a name="l00066"></a>00066 <span class="comment"> *</span>
<a name="l00067"></a>00067 <span class="comment"> * Adaptive background normalization (flexible adaptaption)</span>
<a name="l00068"></a>00068 <span class="comment"> * PIX *pixBackgroundNormFlex() 8 bpp</span>
<a name="l00069"></a>00069 <span class="comment"> *</span>
<a name="l00070"></a>00070 <span class="comment"> * Adaptive contrast normalization</span>
<a name="l00071"></a>00071 <span class="comment"> * PIX *pixContrastNorm() 8 bpp</span>
<a name="l00072"></a>00072 <span class="comment"> * l_int32 pixMinMaxTiles()</span>
<a name="l00073"></a>00073 <span class="comment"> * l_int32 pixSetLowContrast()</span>
<a name="l00074"></a>00074 <span class="comment"> * PIX *pixLinearTRCTiled()</span>
<a name="l00075"></a>00075 <span class="comment"> * static l_int32 *iaaGetLinearTRC()</span>
<a name="l00076"></a>00076 <span class="comment"> *</span>
<a name="l00077"></a>00077 <span class="comment"> * Background normalization is done by generating a reduced map (or set</span>
<a name="l00078"></a>00078 <span class="comment"> * of maps) representing the estimated background value of the</span>
<a name="l00079"></a>00079 <span class="comment"> * input image, and using this to shift the pixel values so that</span>
<a name="l00080"></a>00080 <span class="comment"> * this background value is set to some constant value.</span>
<a name="l00081"></a>00081 <span class="comment"> *</span>
<a name="l00082"></a>00082 <span class="comment"> * Specifically, normalization has 3 steps:</span>
<a name="l00083"></a>00083 <span class="comment"> * (1) Generate a background map at a reduced scale.</span>
<a name="l00084"></a>00084 <span class="comment"> * (2) Make the array of inverted background values by inverting</span>
<a name="l00085"></a>00085 <span class="comment"> * the map. The result is an array of local multiplicative factors.</span>
<a name="l00086"></a>00086 <span class="comment"> * (3) Apply this inverse background map to the image</span>
<a name="l00087"></a>00087 <span class="comment"> *</span>
<a name="l00088"></a>00088 <span class="comment"> * The inverse background arrays can be generated in two different ways here:</span>
<a name="l00089"></a>00089 <span class="comment"> * (1) Remove the 'foreground' pixels and average over the remaining</span>
<a name="l00090"></a>00090 <span class="comment"> * pixels in each tile. Propagate values into tiles where</span>
<a name="l00091"></a>00091 <span class="comment"> * values have not been assigned, either because there was not</span>
<a name="l00092"></a>00092 <span class="comment"> * enough background in the tile or because the tile is covered</span>
<a name="l00093"></a>00093 <span class="comment"> * by a foreground region described by an image mask.</span>
<a name="l00094"></a>00094 <span class="comment"> * After the background map is made, the inverse map is generated by</span>
<a name="l00095"></a>00095 <span class="comment"> * smoothing over some number of adjacent tiles</span>
<a name="l00096"></a>00096 <span class="comment"> * (block convolution) and then inverting.</span>
<a name="l00097"></a>00097 <span class="comment"> * (2) Remove the foreground pixels using a morphological closing</span>
<a name="l00098"></a>00098 <span class="comment"> * on a subsampled version of the image. Propagate values</span>
<a name="l00099"></a>00099 <span class="comment"> * into pixels covered by an optional image mask. Invert the</span>
<a name="l00100"></a>00100 <span class="comment"> * background map without preconditioning by convolutional smoothing.</span>
<a name="l00101"></a>00101 <span class="comment"> *</span>
<a name="l00102"></a>00102 <span class="comment"> * Note: Several of these functions make an implicit assumption about RGB</span>
<a name="l00103"></a>00103 <span class="comment"> * component ordering.</span>
<a name="l00104"></a>00104 <span class="comment"> *</span>
<a name="l00105"></a>00105 <span class="comment"> * Other methods for adaptively normalizing the image are also given here.</span>
<a name="l00106"></a>00106 <span class="comment"> *</span>
<a name="l00107"></a>00107 <span class="comment"> * (1) pixThresholdSpreadNorm() computes a local threshold over the image</span>
<a name="l00108"></a>00108 <span class="comment"> * and normalizes the input pixel values so that this computed threshold</span>
<a name="l00109"></a>00109 <span class="comment"> * is a constant across the entire image.</span>
<a name="l00110"></a>00110 <span class="comment"> *</span>
<a name="l00111"></a>00111 <span class="comment"> * (2) pixContrastNorm() computes and applies a local TRC so that the</span>
<a name="l00112"></a>00112 <span class="comment"> * local dynamic range is expanded to the full 8 bits, where the</span>
<a name="l00113"></a>00113 <span class="comment"> * darkest pixels are mapped to 0 and the lightest to 255. This is</span>
<a name="l00114"></a>00114 <span class="comment"> * useful for improving the appearance of pages with very light</span>
<a name="l00115"></a>00115 <span class="comment"> * foreground or very dark background, and where the local TRC</span>
<a name="l00116"></a>00116 <span class="comment"> * function doesn't change rapidly with position.</span>
<a name="l00117"></a>00117 <span class="comment"> */</span>
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <span class="preprocessor">#include <stdio.h></span>
<a name="l00120"></a>00120 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00121"></a>00121 <span class="preprocessor">#include "<a class="code" href="allheaders_8h.html" title="Includes all required Leptonica header files.">allheaders.h</a>"</span>
<a name="l00122"></a>00122
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="comment">/* Default input parameters for pixBackgroundNormSimple()</span>
<a name="l00125"></a>00125 <span class="comment"> * Note:</span>
<a name="l00126"></a>00126 <span class="comment"> * (1) mincount must never exceed the tile area (width * height)</span>
<a name="l00127"></a>00127 <span class="comment"> * (2) bgval must be sufficiently below 255 to avoid accidental</span>
<a name="l00128"></a>00128 <span class="comment"> * saturation; otherwise it should be large to avoid</span>
<a name="l00129"></a>00129 <span class="comment"> * shrinking the dynamic range</span>
<a name="l00130"></a>00130 <span class="comment"> * (3) results should otherwise not be sensitive to these values</span>
<a name="l00131"></a>00131 <span class="comment"> */</span>
<a name="l00132"></a><a class="code" href="adaptmap_8c.html#a285b7561ec0bd8083ceaf39c1b9883eb">00132</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a285b7561ec0bd8083ceaf39c1b9883eb">DEFAULT_TILE_WIDTH</a> = 10;
<a name="l00133"></a><a class="code" href="adaptmap_8c.html#a77885c1bad42cc94045f21c64a19a3ac">00133</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a77885c1bad42cc94045f21c64a19a3ac">DEFAULT_TILE_HEIGHT</a> = 15;
<a name="l00134"></a><a class="code" href="adaptmap_8c.html#a2605ab4f0fb7dee1e3b6aa7f08c21d12">00134</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a2605ab4f0fb7dee1e3b6aa7f08c21d12">DEFAULT_FG_THRESHOLD</a> = 60;
<a name="l00135"></a><a class="code" href="adaptmap_8c.html#ad6b9b1b76f96eea0e620d886fe24949e">00135</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#ad6b9b1b76f96eea0e620d886fe24949e">DEFAULT_MIN_COUNT</a> = 40;
<a name="l00136"></a><a class="code" href="adaptmap_8c.html#a798fe5a9738d724ea923fedfd20655ca">00136</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a798fe5a9738d724ea923fedfd20655ca">DEFAULT_BG_VAL</a> = 200;
<a name="l00137"></a><a class="code" href="adaptmap_8c.html#a819c2e2f2b54ba7dd87afa09d4ddcf06">00137</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a819c2e2f2b54ba7dd87afa09d4ddcf06">DEFAULT_X_SMOOTH_SIZE</a> = 2;
<a name="l00138"></a><a class="code" href="adaptmap_8c.html#a2d78d68134ce13639af115525d6e3b20">00138</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="adaptmap_8c.html#a2d78d68134ce13639af115525d6e3b20">DEFAULT_Y_SMOOTH_SIZE</a> = 1;
<a name="l00139"></a>00139
<a name="l00140"></a>00140 <span class="keyword">static</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> *<a class="code" href="adaptmap_8c.html#a239c3079c1f5a9da31f92a909fb6fc89">iaaGetLinearTRC</a>(<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> **iaa, <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> diff);
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="preprocessor">#ifndef NO_CONSOLE_IO</span>
<a name="l00143"></a><a class="code" href="adaptmap_8c.html#ad5c208fa570790ba3fc78b4bba087fe5">00143</a> <span class="preprocessor"></span><span class="preprocessor">#define DEBUG_GLOBAL 0</span>
<a name="l00144"></a>00144 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* ~NO_CONSOLE_IO */</span>
<a name="l00145"></a>00145
<a name="l00146"></a>00146
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="comment">/*------------------------------------------------------------------*</span>
<a name="l00149"></a>00149 <span class="comment"> * Adaptive background normalization *</span>
<a name="l00150"></a>00150 <span class="comment"> *------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00151"></a>00151 <span class="comment">/*!</span>
<a name="l00152"></a>00152 <span class="comment"> * pixBackgroundNormSimple()</span>
<a name="l00153"></a>00153 <span class="comment"> *</span>
<a name="l00154"></a>00154 <span class="comment"> * Input: pixs (8 bpp grayscale or 32 bpp rgb)</span>
<a name="l00155"></a>00155 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00156"></a>00156 <span class="comment"> * pixg (<optional> 8 bpp grayscale version; can be null)</span>
<a name="l00157"></a>00157 <span class="comment"> * Return: pixd (8 bpp or 32 bpp rgb), or null on error</span>
<a name="l00158"></a>00158 <span class="comment"> *</span>
<a name="l00159"></a>00159 <span class="comment"> * Notes:</span>
<a name="l00160"></a>00160 <span class="comment"> * (1) This is a simplified interface to pixBackgroundNorm(),</span>
<a name="l00161"></a>00161 <span class="comment"> * where seven parameters are defaulted.</span>
<a name="l00162"></a>00162 <span class="comment"> * (2) The input image is either grayscale or rgb.</span>
<a name="l00163"></a>00163 <span class="comment"> * (3) See pixBackgroundNorm() for usage and function.</span>
<a name="l00164"></a>00164 <span class="comment"> */</span>
<a name="l00165"></a>00165 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00166"></a><a class="code" href="leptprotos_8h.html#af203384a30cd0bc3715feda5951a68db">00166</a> <a class="code" href="adaptmap_8c.html#a233918c78f70365dc44896bdd31f3128">pixBackgroundNormSimple</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00167"></a>00167 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00168"></a>00168 <a class="code" href="struct_pix.html">PIX</a> *pixg)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 <span class="keywordflow">return</span> <a class="code" href="adaptmap_8c.html#aa3fe2b6bb8ae91ed1a60c7e7375c2213">pixBackgroundNorm</a>(pixs, pixim, pixg,
<a name="l00171"></a>00171 <a class="code" href="adaptmap_8c.html#a285b7561ec0bd8083ceaf39c1b9883eb">DEFAULT_TILE_WIDTH</a>, <a class="code" href="adaptmap_8c.html#a77885c1bad42cc94045f21c64a19a3ac">DEFAULT_TILE_HEIGHT</a>,
<a name="l00172"></a>00172 <a class="code" href="adaptmap_8c.html#a2605ab4f0fb7dee1e3b6aa7f08c21d12">DEFAULT_FG_THRESHOLD</a>, <a class="code" href="adaptmap_8c.html#ad6b9b1b76f96eea0e620d886fe24949e">DEFAULT_MIN_COUNT</a>,
<a name="l00173"></a>00173 <a class="code" href="adaptmap_8c.html#a798fe5a9738d724ea923fedfd20655ca">DEFAULT_BG_VAL</a>, <a class="code" href="adaptmap_8c.html#a819c2e2f2b54ba7dd87afa09d4ddcf06">DEFAULT_X_SMOOTH_SIZE</a>,
<a name="l00174"></a>00174 <a class="code" href="adaptmap_8c.html#a2d78d68134ce13639af115525d6e3b20">DEFAULT_Y_SMOOTH_SIZE</a>);
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="comment"></span>
<a name="l00178"></a>00178 <span class="comment">/*!</span>
<a name="l00179"></a>00179 <span class="comment"> * pixBackgroundNorm()</span>
<a name="l00180"></a>00180 <span class="comment"> *</span>
<a name="l00181"></a>00181 <span class="comment"> * Input: pixs (8 bpp grayscale or 32 bpp rgb)</span>
<a name="l00182"></a>00182 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00183"></a>00183 <span class="comment"> * pixg (<optional> 8 bpp grayscale version; can be null)</span>
<a name="l00184"></a>00184 <span class="comment"> * sx, sy (tile size in pixels)</span>
<a name="l00185"></a>00185 <span class="comment"> * thresh (threshold for determining foreground)</span>
<a name="l00186"></a>00186 <span class="comment"> * mincount (min threshold on counts in a tile)</span>
<a name="l00187"></a>00187 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00188"></a>00188 <span class="comment"> * smoothx (half-width of block convolution kernel width)</span>
<a name="l00189"></a>00189 <span class="comment"> * smoothy (half-width of block convolution kernel height)</span>
<a name="l00190"></a>00190 <span class="comment"> * Return: pixd (8 bpp or 32 bpp rgb), or null on error</span>
<a name="l00191"></a>00191 <span class="comment"> *</span>
<a name="l00192"></a>00192 <span class="comment"> * Notes:</span>
<a name="l00193"></a>00193 <span class="comment"> * (1) This is a top-level interface for normalizing the image intensity</span>
<a name="l00194"></a>00194 <span class="comment"> * by mapping the image so that the background is near the input</span>
<a name="l00195"></a>00195 <span class="comment"> * value 'bgval'.</span>
<a name="l00196"></a>00196 <span class="comment"> * (2) The input image is either grayscale or rgb.</span>
<a name="l00197"></a>00197 <span class="comment"> * (3) For each component in the input image, the background value</span>
<a name="l00198"></a>00198 <span class="comment"> * in each tile is estimated using the values in the tile that</span>
<a name="l00199"></a>00199 <span class="comment"> * are not part of the foreground, where the foreground is</span>
<a name="l00200"></a>00200 <span class="comment"> * determined by the input 'thresh' argument.</span>
<a name="l00201"></a>00201 <span class="comment"> * (4) An optional binary mask can be specified, with the foreground</span>
<a name="l00202"></a>00202 <span class="comment"> * pixels typically over image regions. The resulting background</span>
<a name="l00203"></a>00203 <span class="comment"> * map values will be determined by surrounding pixels that are</span>
<a name="l00204"></a>00204 <span class="comment"> * not under the mask foreground. The origin (0,0) of this mask</span>
<a name="l00205"></a>00205 <span class="comment"> * is assumed to be aligned with the origin of the input image.</span>
<a name="l00206"></a>00206 <span class="comment"> * This binary mask must not fully cover pixs, because then there</span>
<a name="l00207"></a>00207 <span class="comment"> * will be no pixels in the input image available to compute</span>
<a name="l00208"></a>00208 <span class="comment"> * the background.</span>
<a name="l00209"></a>00209 <span class="comment"> * (5) An optional grayscale version of the input pixs can be supplied.</span>
<a name="l00210"></a>00210 <span class="comment"> * The only reason to do this is if the input is RGB and this</span>
<a name="l00211"></a>00211 <span class="comment"> * grayscale version can be used elsewhere. If the input is RGB</span>
<a name="l00212"></a>00212 <span class="comment"> * and this is not supplied, it is made internally using only</span>
<a name="l00213"></a>00213 <span class="comment"> * the green component, and destroyed after use.</span>
<a name="l00214"></a>00214 <span class="comment"> * (6) The dimensions of the pixel tile (sx, sy) give the amount by</span>
<a name="l00215"></a>00215 <span class="comment"> * by which the map is reduced in size from the input image.</span>
<a name="l00216"></a>00216 <span class="comment"> * (7) The threshold is used to binarize the input image, in order to</span>
<a name="l00217"></a>00217 <span class="comment"> * locate the foreground components. If this is set too low,</span>
<a name="l00218"></a>00218 <span class="comment"> * some actual foreground may be used to determine the maps;</span>
<a name="l00219"></a>00219 <span class="comment"> * if set too high, there may not be enough background</span>
<a name="l00220"></a>00220 <span class="comment"> * to determine the map values accurately. Typically, it's</span>
<a name="l00221"></a>00221 <span class="comment"> * better to err by setting the threshold too high.</span>
<a name="l00222"></a>00222 <span class="comment"> * (8) A 'mincount' threshold is a minimum count of pixels in a</span>
<a name="l00223"></a>00223 <span class="comment"> * tile for which a background reading is made, in order for that</span>
<a name="l00224"></a>00224 <span class="comment"> * pixel in the map to be valid. This number should perhaps be</span>
<a name="l00225"></a>00225 <span class="comment"> * at least 1/3 the size of the tile.</span>
<a name="l00226"></a>00226 <span class="comment"> * (9) A 'bgval' target background value for the normalized image. This</span>
<a name="l00227"></a>00227 <span class="comment"> * should be at least 128. If set too close to 255, some</span>
<a name="l00228"></a>00228 <span class="comment"> * clipping will occur in the result.</span>
<a name="l00229"></a>00229 <span class="comment"> * (10) Two factors, 'smoothx' and 'smoothy', are input for smoothing</span>
<a name="l00230"></a>00230 <span class="comment"> * the map. Each low-pass filter kernel dimension is</span>
<a name="l00231"></a>00231 <span class="comment"> * is 2 * (smoothing factor) + 1, so a</span>
<a name="l00232"></a>00232 <span class="comment"> * value of 0 means no smoothing. A value of 1 or 2 is recommended.</span>
<a name="l00233"></a>00233 <span class="comment"> */</span>
<a name="l00234"></a>00234 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00235"></a><a class="code" href="leptprotos_8h.html#aade2352749e697225426dbba79fdfa4d">00235</a> <a class="code" href="adaptmap_8c.html#aa3fe2b6bb8ae91ed1a60c7e7375c2213">pixBackgroundNorm</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00236"></a>00236 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00237"></a>00237 <a class="code" href="struct_pix.html">PIX</a> *pixg,
<a name="l00238"></a>00238 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sx,
<a name="l00239"></a>00239 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sy,
<a name="l00240"></a>00240 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> thresh,
<a name="l00241"></a>00241 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> mincount,
<a name="l00242"></a>00242 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval,
<a name="l00243"></a>00243 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothx,
<a name="l00244"></a>00244 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothy)
<a name="l00245"></a>00245 {
<a name="l00246"></a>00246 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> d, allfg;
<a name="l00247"></a>00247 <a class="code" href="struct_pix.html">PIX</a> *pixm, *pixmi, *pixd;
<a name="l00248"></a>00248 <a class="code" href="struct_pix.html">PIX</a> *pixmr, *pixmg, *pixmb, *pixmri, *pixmgi, *pixmbi;
<a name="l00249"></a>00249
<a name="l00250"></a>00250 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNorm"</span>);
<a name="l00251"></a>00251
<a name="l00252"></a>00252 <span class="keywordflow">if</span> (!pixs)
<a name="l00253"></a>00253 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs not defined"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00254"></a>00254 d = <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs);
<a name="l00255"></a>00255 <span class="keywordflow">if</span> (d != 8 && d != 32)
<a name="l00256"></a>00256 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs not 8 or 32 bpp"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00257"></a>00257 <span class="keywordflow">if</span> (sx < 4 || sy < 4)
<a name="l00258"></a>00258 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"sx and sy must be >= 4"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00259"></a>00259 <span class="keywordflow">if</span> (mincount > sx * sy) {
<a name="l00260"></a>00260 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"mincount too large for tile size"</span>, procName);
<a name="l00261"></a>00261 mincount = (sx * sy) / 3;
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00265"></a>00265 <span class="keywordflow">if</span> (pixim) {
<a name="l00266"></a>00266 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00267"></a>00267 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00268"></a>00268 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (allfg)
<a name="l00270"></a>00270 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00271"></a>00271 }
<a name="l00272"></a>00272
<a name="l00273"></a>00273 pixd = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00274"></a>00274 <span class="keywordflow">if</span> (d == 8) {
<a name="l00275"></a>00275 pixm = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00276"></a>00276 <a class="code" href="adaptmap_8c.html#a59a725884de416e753b314efd7d71ca1">pixGetBackgroundGrayMap</a>(pixs, pixim, sx, sy, thresh, mincount, &pixm);
<a name="l00277"></a>00277 <span class="keywordflow">if</span> (!pixm) {
<a name="l00278"></a>00278 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"map not made; returning a copy of the source"</span>, procName);
<a name="l00279"></a>00279 <span class="keywordflow">return</span> <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs);
<a name="l00280"></a>00280 }
<a name="l00281"></a>00281
<a name="l00282"></a>00282 pixmi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixm, bgval, smoothx, smoothy);
<a name="l00283"></a>00283 <span class="keywordflow">if</span> (!pixmi)
<a name="l00284"></a>00284 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixmi not made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00285"></a>00285 <span class="keywordflow">else</span>
<a name="l00286"></a>00286 pixd = <a class="code" href="adaptmap_8c.html#a72d3d614d7c74e1472d3d19e7c0f1824">pixApplyInvBackgroundGrayMap</a>(pixs, pixmi, sx, sy);
<a name="l00287"></a>00287
<a name="l00288"></a>00288 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixm);
<a name="l00289"></a>00289 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmi);
<a name="l00290"></a>00290 }
<a name="l00291"></a>00291 <span class="keywordflow">else</span> {
<a name="l00292"></a>00292 pixmr = pixmg = pixmb = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00293"></a>00293 <a class="code" href="adaptmap_8c.html#a585c22168928353eb067ef7b4a6108ae">pixGetBackgroundRGBMap</a>(pixs, pixim, pixg, sx, sy, thresh,
<a name="l00294"></a>00294 mincount, &pixmr, &pixmg, &pixmb);
<a name="l00295"></a>00295 <span class="keywordflow">if</span> (!pixmr || !pixmg || !pixmb) {
<a name="l00296"></a>00296 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00297"></a>00297 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00298"></a>00298 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00299"></a>00299 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"map not made; returning a copy of the source"</span>, procName);
<a name="l00300"></a>00300 <span class="keywordflow">return</span> <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs);
<a name="l00301"></a>00301 }
<a name="l00302"></a>00302
<a name="l00303"></a>00303 pixmri = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmr, bgval, smoothx, smoothy);
<a name="l00304"></a>00304 pixmgi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmg, bgval, smoothx, smoothy);
<a name="l00305"></a>00305 pixmbi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmb, bgval, smoothx, smoothy);
<a name="l00306"></a>00306 <span class="keywordflow">if</span> (!pixmri || !pixmgi || !pixmbi)
<a name="l00307"></a>00307 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"not all pixm*i are made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00308"></a>00308 <span class="keywordflow">else</span>
<a name="l00309"></a>00309 pixd = <a class="code" href="adaptmap_8c.html#ac907cba948847db16ef5314c237964de">pixApplyInvBackgroundRGBMap</a>(pixs, pixmri, pixmgi, pixmbi,
<a name="l00310"></a>00310 sx, sy);
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00313"></a>00313 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00314"></a>00314 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00315"></a>00315 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmri);
<a name="l00316"></a>00316 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmgi);
<a name="l00317"></a>00317 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmbi);
<a name="l00318"></a>00318 }
<a name="l00319"></a>00319
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (!pixd)
<a name="l00321"></a>00321 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd not made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00322"></a>00322 <span class="keywordflow">return</span> pixd;
<a name="l00323"></a>00323 }
<a name="l00324"></a>00324
<a name="l00325"></a>00325 <span class="comment"></span>
<a name="l00326"></a>00326 <span class="comment">/*!</span>
<a name="l00327"></a>00327 <span class="comment"> * pixBackgroundNormMorph()</span>
<a name="l00328"></a>00328 <span class="comment"> *</span>
<a name="l00329"></a>00329 <span class="comment"> * Input: pixs (8 bpp grayscale or 32 bpp rgb)</span>
<a name="l00330"></a>00330 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00331"></a>00331 <span class="comment"> * reduction (at which morph closings are done; between 2 and 16)</span>
<a name="l00332"></a>00332 <span class="comment"> * size (of square Sel for the closing; use an odd number)</span>
<a name="l00333"></a>00333 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00334"></a>00334 <span class="comment"> * Return: pixd (8 bpp), or null on error</span>
<a name="l00335"></a>00335 <span class="comment"> *</span>
<a name="l00336"></a>00336 <span class="comment"> * Notes:</span>
<a name="l00337"></a>00337 <span class="comment"> * (1) This is a top-level interface for normalizing the image intensity</span>
<a name="l00338"></a>00338 <span class="comment"> * by mapping the image so that the background is near the input</span>
<a name="l00339"></a>00339 <span class="comment"> * value 'bgval'.</span>
<a name="l00340"></a>00340 <span class="comment"> * (2) The input image is either grayscale or rgb.</span>
<a name="l00341"></a>00341 <span class="comment"> * (3) For each component in the input image, the background value</span>
<a name="l00342"></a>00342 <span class="comment"> * is estimated using a grayscale closing; hence the 'Morph'</span>
<a name="l00343"></a>00343 <span class="comment"> * in the function name.</span>
<a name="l00344"></a>00344 <span class="comment"> * (4) An optional binary mask can be specified, with the foreground</span>
<a name="l00345"></a>00345 <span class="comment"> * pixels typically over image regions. The resulting background</span>
<a name="l00346"></a>00346 <span class="comment"> * map values will be determined by surrounding pixels that are</span>
<a name="l00347"></a>00347 <span class="comment"> * not under the mask foreground. The origin (0,0) of this mask</span>
<a name="l00348"></a>00348 <span class="comment"> * is assumed to be aligned with the origin of the input image.</span>
<a name="l00349"></a>00349 <span class="comment"> * This binary mask must not fully cover pixs, because then there</span>
<a name="l00350"></a>00350 <span class="comment"> * will be no pixels in the input image available to compute</span>
<a name="l00351"></a>00351 <span class="comment"> * the background.</span>
<a name="l00352"></a>00352 <span class="comment"> * (5) The map is computed at reduced size (given by 'reduction')</span>
<a name="l00353"></a>00353 <span class="comment"> * from the input pixs and optional pixim. At this scale,</span>
<a name="l00354"></a>00354 <span class="comment"> * pixs is closed to remove the background, using a square Sel</span>
<a name="l00355"></a>00355 <span class="comment"> * of odd dimension. The product of reduction * size should be</span>
<a name="l00356"></a>00356 <span class="comment"> * large enough to remove most of the text foreground.</span>
<a name="l00357"></a>00357 <span class="comment"> * (6) No convolutional smoothing needs to be done on the map before</span>
<a name="l00358"></a>00358 <span class="comment"> * inverting it.</span>
<a name="l00359"></a>00359 <span class="comment"> * (7) A 'bgval' target background value for the normalized image. This</span>
<a name="l00360"></a>00360 <span class="comment"> * should be at least 128. If set too close to 255, some</span>
<a name="l00361"></a>00361 <span class="comment"> * clipping will occur in the result.</span>
<a name="l00362"></a>00362 <span class="comment"> */</span>
<a name="l00363"></a>00363 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00364"></a><a class="code" href="leptprotos_8h.html#a71249f5a41b37aa8d20811d0b50394ca">00364</a> <a class="code" href="adaptmap_8c.html#affcfd6286be3fa5b622ae23dcf219fbf">pixBackgroundNormMorph</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00365"></a>00365 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00366"></a>00366 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> reduction,
<a name="l00367"></a>00367 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="warper__reg_8c.html#a711275dc7bbe85bb6fa721bc60b8637c">size</a>,
<a name="l00368"></a>00368 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval)
<a name="l00369"></a>00369 {
<a name="l00370"></a>00370 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> d, allfg;
<a name="l00371"></a>00371 <a class="code" href="struct_pix.html">PIX</a> *pixm, *pixmi, *pixd;
<a name="l00372"></a>00372 <a class="code" href="struct_pix.html">PIX</a> *pixmr, *pixmg, *pixmb, *pixmri, *pixmgi, *pixmbi;
<a name="l00373"></a>00373
<a name="l00374"></a>00374 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNormMorph"</span>);
<a name="l00375"></a>00375
<a name="l00376"></a>00376 <span class="keywordflow">if</span> (!pixs)
<a name="l00377"></a>00377 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs not defined"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00378"></a>00378 d = <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs);
<a name="l00379"></a>00379 <span class="keywordflow">if</span> (d != 8 && d != 32)
<a name="l00380"></a>00380 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs not 8 or 32 bpp"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00381"></a>00381 <span class="keywordflow">if</span> (reduction < 2 || reduction > 16)
<a name="l00382"></a>00382 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"reduction must be between 2 and 16"</span>,
<a name="l00383"></a>00383 procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00384"></a>00384
<a name="l00385"></a>00385 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00386"></a>00386 <span class="keywordflow">if</span> (pixim) {
<a name="l00387"></a>00387 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00388"></a>00388 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00389"></a>00389 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00390"></a>00390 <span class="keywordflow">if</span> (allfg)
<a name="l00391"></a>00391 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00392"></a>00392 }
<a name="l00393"></a>00393
<a name="l00394"></a>00394 pixd = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00395"></a>00395 <span class="keywordflow">if</span> (d == 8) {
<a name="l00396"></a>00396 <a class="code" href="adaptmap_8c.html#affe15c0de2f0c21a3c9e6042b2f451b7">pixGetBackgroundGrayMapMorph</a>(pixs, pixim, reduction, size, &pixm);
<a name="l00397"></a>00397 <span class="keywordflow">if</span> (!pixm)
<a name="l00398"></a>00398 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixm not made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00399"></a>00399 pixmi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixm, bgval, 0, 0);
<a name="l00400"></a>00400 <span class="keywordflow">if</span> (!pixmi)
<a name="l00401"></a>00401 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixmi not made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00402"></a>00402 <span class="keywordflow">else</span>
<a name="l00403"></a>00403 pixd = <a class="code" href="adaptmap_8c.html#a72d3d614d7c74e1472d3d19e7c0f1824">pixApplyInvBackgroundGrayMap</a>(pixs, pixmi,
<a name="l00404"></a>00404 reduction, reduction);
<a name="l00405"></a>00405 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixm);
<a name="l00406"></a>00406 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmi);
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408 <span class="keywordflow">else</span> { <span class="comment">/* d == 32 */</span>
<a name="l00409"></a>00409 pixmr = pixmg = pixmb = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00410"></a>00410 <a class="code" href="adaptmap_8c.html#a68a15cb82890d5209d82a411ecb0421e">pixGetBackgroundRGBMapMorph</a>(pixs, pixim, reduction, size,
<a name="l00411"></a>00411 &pixmr, &pixmg, &pixmb);
<a name="l00412"></a>00412 <span class="keywordflow">if</span> (!pixmr || !pixmg || !pixmb) {
<a name="l00413"></a>00413 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00414"></a>00414 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00415"></a>00415 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00416"></a>00416 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"not all pixm*"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00417"></a>00417 }
<a name="l00418"></a>00418
<a name="l00419"></a>00419 pixmri = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmr, bgval, 0, 0);
<a name="l00420"></a>00420 pixmgi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmg, bgval, 0, 0);
<a name="l00421"></a>00421 pixmbi = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmb, bgval, 0, 0);
<a name="l00422"></a>00422 <span class="keywordflow">if</span> (!pixmri || !pixmgi || !pixmbi)
<a name="l00423"></a>00423 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"not all pixm*i are made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00424"></a>00424 <span class="keywordflow">else</span>
<a name="l00425"></a>00425 pixd = <a class="code" href="adaptmap_8c.html#ac907cba948847db16ef5314c237964de">pixApplyInvBackgroundRGBMap</a>(pixs, pixmri, pixmgi, pixmbi,
<a name="l00426"></a>00426 reduction, reduction);
<a name="l00427"></a>00427
<a name="l00428"></a>00428 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00429"></a>00429 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00430"></a>00430 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00431"></a>00431 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmri);
<a name="l00432"></a>00432 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmgi);
<a name="l00433"></a>00433 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmbi);
<a name="l00434"></a>00434 }
<a name="l00435"></a>00435
<a name="l00436"></a>00436 <span class="keywordflow">if</span> (!pixd)
<a name="l00437"></a>00437 <a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd not made"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00438"></a>00438 <span class="keywordflow">return</span> pixd;
<a name="l00439"></a>00439 }
<a name="l00440"></a>00440
<a name="l00441"></a>00441
<a name="l00442"></a>00442 <span class="comment">/*-------------------------------------------------------------------------*</span>
<a name="l00443"></a>00443 <span class="comment"> * Arrays of inverted background values for normalization *</span>
<a name="l00444"></a>00444 <span class="comment"> *-------------------------------------------------------------------------*</span>
<a name="l00445"></a>00445 <span class="comment"> * Notes for these four functions: *</span>
<a name="l00446"></a>00446 <span class="comment"> * (1) They are useful if you need to save the actual mapping array. *</span>
<a name="l00447"></a>00447 <span class="comment"> * (2) They could be used in the top-level functions but are *</span>
<a name="l00448"></a>00448 <span class="comment"> * not because their use makes those functions less clear. *</span>
<a name="l00449"></a>00449 <span class="comment"> * (3) Each component in the input pixs generates a 16 bpp pix array. *</span>
<a name="l00450"></a>00450 <span class="comment"> *-------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00451"></a>00451 <span class="comment">/*!</span>
<a name="l00452"></a>00452 <span class="comment"> * pixBackgroundNormGrayArray()</span>
<a name="l00453"></a>00453 <span class="comment"> *</span>
<a name="l00454"></a>00454 <span class="comment"> * Input: pixs (8 bpp grayscale)</span>
<a name="l00455"></a>00455 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00456"></a>00456 <span class="comment"> * sx, sy (tile size in pixels)</span>
<a name="l00457"></a>00457 <span class="comment"> * thresh (threshold for determining foreground)</span>
<a name="l00458"></a>00458 <span class="comment"> * mincount (min threshold on counts in a tile)</span>
<a name="l00459"></a>00459 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00460"></a>00460 <span class="comment"> * smoothx (half-width of block convolution kernel width)</span>
<a name="l00461"></a>00461 <span class="comment"> * smoothy (half-width of block convolution kernel height)</span>
<a name="l00462"></a>00462 <span class="comment"> * &pixd (<return> 16 bpp array of inverted background value)</span>
<a name="l00463"></a>00463 <span class="comment"> * Return: 0 if OK, 1 on error</span>
<a name="l00464"></a>00464 <span class="comment"> *</span>
<a name="l00465"></a>00465 <span class="comment"> * Notes:</span>
<a name="l00466"></a>00466 <span class="comment"> * (1) See notes in pixBackgroundNorm().</span>
<a name="l00467"></a>00467 <span class="comment"> * (2) This returns a 16 bpp pix that can be used by </span>
<a name="l00468"></a>00468 <span class="comment"> * pixApplyInvBackgroundGrayMap() to generate a normalized version</span>
<a name="l00469"></a>00469 <span class="comment"> * of the input pixs.</span>
<a name="l00470"></a>00470 <span class="comment"> */</span>
<a name="l00471"></a>00471 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00472"></a><a class="code" href="leptprotos_8h.html#aff79b4aaeb6eed9fe2e8465ef4ba8bfb">00472</a> <a class="code" href="adaptmap_8c.html#afb9d7d9b75ffc3c4feae308b437ceb78">pixBackgroundNormGrayArray</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00473"></a>00473 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00474"></a>00474 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sx,
<a name="l00475"></a>00475 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sy,
<a name="l00476"></a>00476 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> thresh,
<a name="l00477"></a>00477 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> mincount,
<a name="l00478"></a>00478 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval,
<a name="l00479"></a>00479 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothx,
<a name="l00480"></a>00480 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothy,
<a name="l00481"></a>00481 <a class="code" href="struct_pix.html">PIX</a> **ppixd)
<a name="l00482"></a>00482 {
<a name="l00483"></a>00483 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> allfg;
<a name="l00484"></a>00484 <a class="code" href="struct_pix.html">PIX</a> *pixm;
<a name="l00485"></a>00485
<a name="l00486"></a>00486 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNormGrayArray"</span>);
<a name="l00487"></a>00487
<a name="l00488"></a>00488 <span class="keywordflow">if</span> (!ppixd)
<a name="l00489"></a>00489 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"&pixd not defined"</span>, procName, 1);
<a name="l00490"></a>00490 *ppixd = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00491"></a>00491 <span class="keywordflow">if</span> (!pixs || <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs) != 8)
<a name="l00492"></a>00492 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not defined or not 8 bpp"</span>, procName, 1);
<a name="l00493"></a>00493 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a6c959f1c381ebe5a4abc867a3d8ae1e6">pixGetColormap</a>(pixs))
<a name="l00494"></a>00494 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs is colormapped"</span>, procName, 1);
<a name="l00495"></a>00495 <span class="keywordflow">if</span> (pixim && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixim) != 1)
<a name="l00496"></a>00496 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim not 1 bpp"</span>, procName, 1);
<a name="l00497"></a>00497 <span class="keywordflow">if</span> (sx < 4 || sy < 4)
<a name="l00498"></a>00498 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"sx and sy must be >= 4"</span>, procName, 1);
<a name="l00499"></a>00499 <span class="keywordflow">if</span> (mincount > sx * sy) {
<a name="l00500"></a>00500 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"mincount too large for tile size"</span>, procName);
<a name="l00501"></a>00501 mincount = (sx * sy) / 3;
<a name="l00502"></a>00502 }
<a name="l00503"></a>00503
<a name="l00504"></a>00504 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00505"></a>00505 <span class="keywordflow">if</span> (pixim) {
<a name="l00506"></a>00506 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00507"></a>00507 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00508"></a>00508 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00509"></a>00509 <span class="keywordflow">if</span> (allfg)
<a name="l00510"></a>00510 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, 1);
<a name="l00511"></a>00511 }
<a name="l00512"></a>00512
<a name="l00513"></a>00513 <a class="code" href="adaptmap_8c.html#a59a725884de416e753b314efd7d71ca1">pixGetBackgroundGrayMap</a>(pixs, pixim, sx, sy, thresh, mincount, &pixm);
<a name="l00514"></a>00514 <span class="keywordflow">if</span> (!pixm)
<a name="l00515"></a>00515 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixm not made"</span>, procName, 1);
<a name="l00516"></a>00516 *ppixd = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixm, bgval, smoothx, smoothy);
<a name="l00517"></a>00517 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixm);
<a name="l00518"></a>00518 <span class="keywordflow">return</span> 0;
<a name="l00519"></a>00519 }
<a name="l00520"></a>00520
<a name="l00521"></a>00521 <span class="comment"></span>
<a name="l00522"></a>00522 <span class="comment">/*!</span>
<a name="l00523"></a>00523 <span class="comment"> * pixBackgroundNormRGBArrays()</span>
<a name="l00524"></a>00524 <span class="comment"> *</span>
<a name="l00525"></a>00525 <span class="comment"> * Input: pixs (32 bpp rgb)</span>
<a name="l00526"></a>00526 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00527"></a>00527 <span class="comment"> * pixg (<optional> 8 bpp grayscale version; can be null)</span>
<a name="l00528"></a>00528 <span class="comment"> * sx, sy (tile size in pixels)</span>
<a name="l00529"></a>00529 <span class="comment"> * thresh (threshold for determining foreground)</span>
<a name="l00530"></a>00530 <span class="comment"> * mincount (min threshold on counts in a tile)</span>
<a name="l00531"></a>00531 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00532"></a>00532 <span class="comment"> * smoothx (half-width of block convolution kernel width)</span>
<a name="l00533"></a>00533 <span class="comment"> * smoothy (half-width of block convolution kernel height)</span>
<a name="l00534"></a>00534 <span class="comment"> * &pixr (<return> 16 bpp array of inverted R background value)</span>
<a name="l00535"></a>00535 <span class="comment"> * &pixg (<return> 16 bpp array of inverted G background value)</span>
<a name="l00536"></a>00536 <span class="comment"> * &pixb (<return> 16 bpp array of inverted B background value)</span>
<a name="l00537"></a>00537 <span class="comment"> * Return: 0 if OK, 1 on error</span>
<a name="l00538"></a>00538 <span class="comment"> *</span>
<a name="l00539"></a>00539 <span class="comment"> * Notes:</span>
<a name="l00540"></a>00540 <span class="comment"> * (1) See notes in pixBackgroundNorm().</span>
<a name="l00541"></a>00541 <span class="comment"> * (2) This returns a set of three 16 bpp pix that can be used by </span>
<a name="l00542"></a>00542 <span class="comment"> * pixApplyInvBackgroundGrayMap() to generate a normalized version</span>
<a name="l00543"></a>00543 <span class="comment"> * of each component of the input pixs.</span>
<a name="l00544"></a>00544 <span class="comment"> */</span>
<a name="l00545"></a>00545 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00546"></a><a class="code" href="leptprotos_8h.html#a27790b4737ca2b5965a4914e620d7566">00546</a> <a class="code" href="adaptmap_8c.html#add048bf24e2cf94820ebb0be52943950">pixBackgroundNormRGBArrays</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00547"></a>00547 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00548"></a>00548 <a class="code" href="struct_pix.html">PIX</a> *pixg,
<a name="l00549"></a>00549 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sx,
<a name="l00550"></a>00550 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sy,
<a name="l00551"></a>00551 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> thresh,
<a name="l00552"></a>00552 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> mincount,
<a name="l00553"></a>00553 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval,
<a name="l00554"></a>00554 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothx,
<a name="l00555"></a>00555 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> smoothy,
<a name="l00556"></a>00556 <a class="code" href="struct_pix.html">PIX</a> **ppixr,
<a name="l00557"></a>00557 <a class="code" href="struct_pix.html">PIX</a> **ppixg,
<a name="l00558"></a>00558 <a class="code" href="struct_pix.html">PIX</a> **ppixb)
<a name="l00559"></a>00559 {
<a name="l00560"></a>00560 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> allfg;
<a name="l00561"></a>00561 <a class="code" href="struct_pix.html">PIX</a> *pixmr, *pixmg, *pixmb;
<a name="l00562"></a>00562
<a name="l00563"></a>00563 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNormRGBArrays"</span>);
<a name="l00564"></a>00564
<a name="l00565"></a>00565 <span class="keywordflow">if</span> (!ppixr || !ppixg || !ppixb)
<a name="l00566"></a>00566 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"&pixr, &pixg, &pixb not all defined"</span>, procName, 1);
<a name="l00567"></a>00567 *ppixr = *ppixg = *ppixb = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00568"></a>00568 <span class="keywordflow">if</span> (!pixs)
<a name="l00569"></a>00569 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not defined"</span>, procName, 1);
<a name="l00570"></a>00570 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs) != 32)
<a name="l00571"></a>00571 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not 32 bpp"</span>, procName, 1);
<a name="l00572"></a>00572 <span class="keywordflow">if</span> (pixim && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixim) != 1)
<a name="l00573"></a>00573 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim not 1 bpp"</span>, procName, 1);
<a name="l00574"></a>00574 <span class="keywordflow">if</span> (sx < 4 || sy < 4)
<a name="l00575"></a>00575 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"sx and sy must be >= 4"</span>, procName, 1);
<a name="l00576"></a>00576 <span class="keywordflow">if</span> (mincount > sx * sy) {
<a name="l00577"></a>00577 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"mincount too large for tile size"</span>, procName);
<a name="l00578"></a>00578 mincount = (sx * sy) / 3;
<a name="l00579"></a>00579 }
<a name="l00580"></a>00580
<a name="l00581"></a>00581 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00582"></a>00582 <span class="keywordflow">if</span> (pixim) {
<a name="l00583"></a>00583 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00584"></a>00584 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00585"></a>00585 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00586"></a>00586 <span class="keywordflow">if</span> (allfg)
<a name="l00587"></a>00587 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, 1);
<a name="l00588"></a>00588 }
<a name="l00589"></a>00589
<a name="l00590"></a>00590 <a class="code" href="adaptmap_8c.html#a585c22168928353eb067ef7b4a6108ae">pixGetBackgroundRGBMap</a>(pixs, pixim, pixg, sx, sy, thresh, mincount,
<a name="l00591"></a>00591 &pixmr, &pixmg, &pixmb);
<a name="l00592"></a>00592 <span class="keywordflow">if</span> (!pixmr || !pixmg || !pixmb) {
<a name="l00593"></a>00593 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00594"></a>00594 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00595"></a>00595 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00596"></a>00596 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"not all pixm* made"</span>, procName, 1);
<a name="l00597"></a>00597 }
<a name="l00598"></a>00598
<a name="l00599"></a>00599 *ppixr = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmr, bgval, smoothx, smoothy);
<a name="l00600"></a>00600 *ppixg = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmg, bgval, smoothx, smoothy);
<a name="l00601"></a>00601 *ppixb = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmb, bgval, smoothx, smoothy);
<a name="l00602"></a>00602 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00603"></a>00603 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00604"></a>00604 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00605"></a>00605 <span class="keywordflow">return</span> 0;
<a name="l00606"></a>00606 }
<a name="l00607"></a>00607
<a name="l00608"></a>00608 <span class="comment"></span>
<a name="l00609"></a>00609 <span class="comment">/*!</span>
<a name="l00610"></a>00610 <span class="comment"> * pixBackgroundNormGrayArrayMorph()</span>
<a name="l00611"></a>00611 <span class="comment"> *</span>
<a name="l00612"></a>00612 <span class="comment"> * Input: pixs (8 bpp grayscale)</span>
<a name="l00613"></a>00613 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00614"></a>00614 <span class="comment"> * reduction (at which morph closings are done; between 2 and 16)</span>
<a name="l00615"></a>00615 <span class="comment"> * size (of square Sel for the closing; use an odd number)</span>
<a name="l00616"></a>00616 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00617"></a>00617 <span class="comment"> * &pixd (<return> 16 bpp array of inverted background value)</span>
<a name="l00618"></a>00618 <span class="comment"> * Return: 0 if OK, 1 on error</span>
<a name="l00619"></a>00619 <span class="comment"> *</span>
<a name="l00620"></a>00620 <span class="comment"> * Notes:</span>
<a name="l00621"></a>00621 <span class="comment"> * (1) See notes in pixBackgroundNormMorph().</span>
<a name="l00622"></a>00622 <span class="comment"> * (2) This returns a 16 bpp pix that can be used by </span>
<a name="l00623"></a>00623 <span class="comment"> * pixApplyInvBackgroundGrayMap() to generate a normalized version</span>
<a name="l00624"></a>00624 <span class="comment"> * of the input pixs.</span>
<a name="l00625"></a>00625 <span class="comment"> */</span>
<a name="l00626"></a>00626 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00627"></a><a class="code" href="leptprotos_8h.html#a13ffa1ff37b62dedcefbc778982d1918">00627</a> <a class="code" href="adaptmap_8c.html#a76cc4d9363a7cdeb56abcfb79531a0aa">pixBackgroundNormGrayArrayMorph</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00628"></a>00628 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00629"></a>00629 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> reduction,
<a name="l00630"></a>00630 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="warper__reg_8c.html#a711275dc7bbe85bb6fa721bc60b8637c">size</a>,
<a name="l00631"></a>00631 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval,
<a name="l00632"></a>00632 <a class="code" href="struct_pix.html">PIX</a> **ppixd)
<a name="l00633"></a>00633 {
<a name="l00634"></a>00634 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> allfg;
<a name="l00635"></a>00635 <a class="code" href="struct_pix.html">PIX</a> *pixm;
<a name="l00636"></a>00636
<a name="l00637"></a>00637 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNormGrayArrayMorph"</span>);
<a name="l00638"></a>00638
<a name="l00639"></a>00639 <span class="keywordflow">if</span> (!ppixd)
<a name="l00640"></a>00640 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"&pixd not defined"</span>, procName, 1);
<a name="l00641"></a>00641 *ppixd = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00642"></a>00642 <span class="keywordflow">if</span> (!pixs)
<a name="l00643"></a>00643 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not defined"</span>, procName, 1);
<a name="l00644"></a>00644 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs) != 8)
<a name="l00645"></a>00645 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not 8 bpp"</span>, procName, 1);
<a name="l00646"></a>00646 <span class="keywordflow">if</span> (pixim && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixim) != 1)
<a name="l00647"></a>00647 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim not 1 bpp"</span>, procName, 1);
<a name="l00648"></a>00648 <span class="keywordflow">if</span> (reduction < 2 || reduction > 16)
<a name="l00649"></a>00649 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"reduction must be between 2 and 16"</span>, procName, 1);
<a name="l00650"></a>00650
<a name="l00651"></a>00651 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00652"></a>00652 <span class="keywordflow">if</span> (pixim) {
<a name="l00653"></a>00653 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00654"></a>00654 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00655"></a>00655 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00656"></a>00656 <span class="keywordflow">if</span> (allfg)
<a name="l00657"></a>00657 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, 1);
<a name="l00658"></a>00658 }
<a name="l00659"></a>00659
<a name="l00660"></a>00660 <a class="code" href="adaptmap_8c.html#affe15c0de2f0c21a3c9e6042b2f451b7">pixGetBackgroundGrayMapMorph</a>(pixs, pixim, reduction, size, &pixm);
<a name="l00661"></a>00661 <span class="keywordflow">if</span> (!pixm)
<a name="l00662"></a>00662 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixm not made"</span>, procName, 1);
<a name="l00663"></a>00663 *ppixd = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixm, bgval, 0, 0);
<a name="l00664"></a>00664 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixm);
<a name="l00665"></a>00665 <span class="keywordflow">return</span> 0;
<a name="l00666"></a>00666 }
<a name="l00667"></a>00667
<a name="l00668"></a>00668 <span class="comment"></span>
<a name="l00669"></a>00669 <span class="comment">/*!</span>
<a name="l00670"></a>00670 <span class="comment"> * pixBackgroundNormRGBArraysMorph()</span>
<a name="l00671"></a>00671 <span class="comment"> *</span>
<a name="l00672"></a>00672 <span class="comment"> * Input: pixs (32 bpp rgb)</span>
<a name="l00673"></a>00673 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null)</span>
<a name="l00674"></a>00674 <span class="comment"> * reduction (at which morph closings are done; between 2 and 16)</span>
<a name="l00675"></a>00675 <span class="comment"> * size (of square Sel for the closing; use an odd number)</span>
<a name="l00676"></a>00676 <span class="comment"> * bgval (target bg val; typ. > 128)</span>
<a name="l00677"></a>00677 <span class="comment"> * &pixr (<return> 16 bpp array of inverted R background value)</span>
<a name="l00678"></a>00678 <span class="comment"> * &pixg (<return> 16 bpp array of inverted G background value)</span>
<a name="l00679"></a>00679 <span class="comment"> * &pixb (<return> 16 bpp array of inverted B background value)</span>
<a name="l00680"></a>00680 <span class="comment"> * Return: 0 if OK, 1 on error</span>
<a name="l00681"></a>00681 <span class="comment"> *</span>
<a name="l00682"></a>00682 <span class="comment"> * Notes:</span>
<a name="l00683"></a>00683 <span class="comment"> * (1) See notes in pixBackgroundNormMorph().</span>
<a name="l00684"></a>00684 <span class="comment"> * (2) This returns a set of three 16 bpp pix that can be used by </span>
<a name="l00685"></a>00685 <span class="comment"> * pixApplyInvBackgroundGrayMap() to generate a normalized version</span>
<a name="l00686"></a>00686 <span class="comment"> * of each component of the input pixs.</span>
<a name="l00687"></a>00687 <span class="comment"> */</span>
<a name="l00688"></a>00688 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00689"></a><a class="code" href="leptprotos_8h.html#a1b010febac7341c32adf125ba28019ab">00689</a> <a class="code" href="adaptmap_8c.html#ad17d0d5e57a33f020e0db24cb0f593a0">pixBackgroundNormRGBArraysMorph</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00690"></a>00690 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00691"></a>00691 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> reduction,
<a name="l00692"></a>00692 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="warper__reg_8c.html#a711275dc7bbe85bb6fa721bc60b8637c">size</a>,
<a name="l00693"></a>00693 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bgval,
<a name="l00694"></a>00694 <a class="code" href="struct_pix.html">PIX</a> **ppixr,
<a name="l00695"></a>00695 <a class="code" href="struct_pix.html">PIX</a> **ppixg,
<a name="l00696"></a>00696 <a class="code" href="struct_pix.html">PIX</a> **ppixb)
<a name="l00697"></a>00697 {
<a name="l00698"></a>00698 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> allfg;
<a name="l00699"></a>00699 <a class="code" href="struct_pix.html">PIX</a> *pixmr, *pixmg, *pixmb;
<a name="l00700"></a>00700
<a name="l00701"></a>00701 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBackgroundNormRGBArraysMorph"</span>);
<a name="l00702"></a>00702
<a name="l00703"></a>00703 <span class="keywordflow">if</span> (!ppixr || !ppixg || !ppixb)
<a name="l00704"></a>00704 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"&pixr, &pixg, &pixb not all defined"</span>, procName, 1);
<a name="l00705"></a>00705 *ppixr = *ppixg = *ppixb = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00706"></a>00706 <span class="keywordflow">if</span> (!pixs)
<a name="l00707"></a>00707 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not defined"</span>, procName, 1);
<a name="l00708"></a>00708 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs) != 32)
<a name="l00709"></a>00709 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not 32 bpp"</span>, procName, 1);
<a name="l00710"></a>00710 <span class="keywordflow">if</span> (pixim && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixim) != 1)
<a name="l00711"></a>00711 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim not 1 bpp"</span>, procName, 1);
<a name="l00712"></a>00712 <span class="keywordflow">if</span> (reduction < 2 || reduction > 16)
<a name="l00713"></a>00713 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"reduction must be between 2 and 16"</span>, procName, 1);
<a name="l00714"></a>00714
<a name="l00715"></a>00715 <span class="comment">/* If pixim exists, verify that it is not all foreground. */</span>
<a name="l00716"></a>00716 <span class="keywordflow">if</span> (pixim) {
<a name="l00717"></a>00717 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00718"></a>00718 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &allfg);
<a name="l00719"></a>00719 <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(pixim, pixim);
<a name="l00720"></a>00720 <span class="keywordflow">if</span> (allfg)
<a name="l00721"></a>00721 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim all foreground"</span>, procName, 1);
<a name="l00722"></a>00722 }
<a name="l00723"></a>00723
<a name="l00724"></a>00724 <a class="code" href="adaptmap_8c.html#a68a15cb82890d5209d82a411ecb0421e">pixGetBackgroundRGBMapMorph</a>(pixs, pixim, reduction, size,
<a name="l00725"></a>00725 &pixmr, &pixmg, &pixmb);
<a name="l00726"></a>00726 <span class="keywordflow">if</span> (!pixmr || !pixmg || !pixmb) {
<a name="l00727"></a>00727 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00728"></a>00728 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00729"></a>00729 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00730"></a>00730 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"not all pixm* made"</span>, procName, 1);
<a name="l00731"></a>00731 }
<a name="l00732"></a>00732
<a name="l00733"></a>00733 *ppixr = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmr, bgval, 0, 0);
<a name="l00734"></a>00734 *ppixg = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmg, bgval, 0, 0);
<a name="l00735"></a>00735 *ppixb = <a class="code" href="adaptmap_8c.html#a7091e401bb650442dcb107af4dfd5fcd">pixGetInvBackgroundMap</a>(pixmb, bgval, 0, 0);
<a name="l00736"></a>00736 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmr);
<a name="l00737"></a>00737 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmg);
<a name="l00738"></a>00738 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixmb);
<a name="l00739"></a>00739 <span class="keywordflow">return</span> 0;
<a name="l00740"></a>00740 }
<a name="l00741"></a>00741
<a name="l00742"></a>00742
<a name="l00743"></a>00743 <span class="comment">/*------------------------------------------------------------------*</span>
<a name="l00744"></a>00744 <span class="comment"> * Measurement of local background *</span>
<a name="l00745"></a>00745 <span class="comment"> *------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00746"></a>00746 <span class="comment">/*!</span>
<a name="l00747"></a>00747 <span class="comment"> * pixGetBackgroundGrayMap()</span>
<a name="l00748"></a>00748 <span class="comment"> *</span>
<a name="l00749"></a>00749 <span class="comment"> * Input: pixs (8 bpp grayscale; not cmapped)</span>
<a name="l00750"></a>00750 <span class="comment"> * pixim (<optional> 1 bpp 'image' mask; can be null; it</span>
<a name="l00751"></a>00751 <span class="comment"> * should not have all foreground pixels)</span>
<a name="l00752"></a>00752 <span class="comment"> * sx, sy (tile size in pixels)</span>
<a name="l00753"></a>00753 <span class="comment"> * thresh (threshold for determining foreground)</span>
<a name="l00754"></a>00754 <span class="comment"> * mincount (min threshold on counts in a tile)</span>
<a name="l00755"></a>00755 <span class="comment"> * &pixd (<return> 8 bpp grayscale map)</span>
<a name="l00756"></a>00756 <span class="comment"> * Return: 0 if OK, 1 on error</span>
<a name="l00757"></a>00757 <span class="comment"> *</span>
<a name="l00758"></a>00758 <span class="comment"> * Notes:</span>
<a name="l00759"></a>00759 <span class="comment"> * (1) The background is measured in regions that don't have</span>
<a name="l00760"></a>00760 <span class="comment"> * images. It is then propagated into the image regions,</span>
<a name="l00761"></a>00761 <span class="comment"> * and finally smoothed in each image region.</span>
<a name="l00762"></a>00762 <span class="comment"> */</span>
<a name="l00763"></a>00763 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00764"></a><a class="code" href="leptprotos_8h.html#a46f66c7d8d92f743ebb5a86f6061ab63">00764</a> <a class="code" href="adaptmap_8c.html#a59a725884de416e753b314efd7d71ca1">pixGetBackgroundGrayMap</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs,
<a name="l00765"></a>00765 <a class="code" href="struct_pix.html">PIX</a> *pixim,
<a name="l00766"></a>00766 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sx,
<a name="l00767"></a>00767 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sy,
<a name="l00768"></a>00768 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> thresh,
<a name="l00769"></a>00769 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> mincount,
<a name="l00770"></a>00770 <a class="code" href="struct_pix.html">PIX</a> **ppixd)
<a name="l00771"></a>00771 {
<a name="l00772"></a>00772 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> w, h, wd, hd, wim, him, wpls, wplim, wpld, wplf;
<a name="l00773"></a>00773 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> xim, yim, delx, <a class="code" href="pixaatest_8c.html#aa4374004b101d3331b46aeef4a143df0">nx</a>, <a class="code" href="pixaatest_8c.html#aa550651119730c08ba0d3ceb1f7c6b5f">ny</a>, i, j, k, m;
<a name="l00774"></a>00774 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> count, sum, val8;
<a name="l00775"></a>00775 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> empty, fgpixels;
<a name="l00776"></a>00776 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *datas, *dataim, *datad, *dataf, *lines, *lineim, *lined, *linef;
<a name="l00777"></a>00777 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> scalex, scaley;
<a name="l00778"></a>00778 <a class="code" href="struct_pix.html">PIX</a> *pixd, *piximi, *pixb, *pixf, *pixims;
<a name="l00779"></a>00779
<a name="l00780"></a>00780 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixGetBackgroundGrayMap"</span>);
<a name="l00781"></a>00781
<a name="l00782"></a>00782 <span class="keywordflow">if</span> (!ppixd)
<a name="l00783"></a>00783 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"&pixd not defined"</span>, procName, 1);
<a name="l00784"></a>00784 *ppixd = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00785"></a>00785 <span class="keywordflow">if</span> (!pixs || <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs) != 8)
<a name="l00786"></a>00786 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs not defined or not 8 bpp"</span>, procName, 1);
<a name="l00787"></a>00787 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a6c959f1c381ebe5a4abc867a3d8ae1e6">pixGetColormap</a>(pixs))
<a name="l00788"></a>00788 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixs is colormapped"</span>, procName, 1);
<a name="l00789"></a>00789 <span class="keywordflow">if</span> (pixim && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixim) != 1)
<a name="l00790"></a>00790 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim not 1 bpp"</span>, procName, 1);
<a name="l00791"></a>00791 <span class="keywordflow">if</span> (sx < 4 || sy < 4)
<a name="l00792"></a>00792 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"sx and sy must be >= 4"</span>, procName, 1);
<a name="l00793"></a>00793 <span class="keywordflow">if</span> (mincount > sx * sy) {
<a name="l00794"></a>00794 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"mincount too large for tile size"</span>, procName);
<a name="l00795"></a>00795 mincount = (sx * sy) / 3;
<a name="l00796"></a>00796 }
<a name="l00797"></a>00797
<a name="l00798"></a>00798 <span class="comment">/* Evaluate the 'image' mask, pixim, and make sure</span>
<a name="l00799"></a>00799 <span class="comment"> * it is not all fg. */</span>
<a name="l00800"></a>00800 fgpixels = 0; <span class="comment">/* boolean for existence of fg pixels in the image mask. */</span>
<a name="l00801"></a>00801 <span class="keywordflow">if</span> (pixim) {
<a name="l00802"></a>00802 piximi = <a class="code" href="leptprotos_8h.html#a6f0dcf6a1fb094a9354b2ec890d46f0c">pixInvert</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixim); <span class="comment">/* set non-'image' pixels to 1 */</span>
<a name="l00803"></a>00803 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(piximi, &empty);
<a name="l00804"></a>00804 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&piximi);
<a name="l00805"></a>00805 <span class="keywordflow">if</span> (empty)
<a name="l00806"></a>00806 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">"pixim all fg; no background"</span>, procName, 1);
<a name="l00807"></a>00807 <a class="code" href="leptprotos_8h.html#a6a235d616cb936fa779f4aea0706a0b3">pixZero</a>(pixim, &empty);
<a name="l00808"></a>00808 <span class="keywordflow">if</span> (!empty) <span class="comment">/* there are fg pixels in pixim */</span>
<a name="l00809"></a>00809 fgpixels = 1;
<a name="l00810"></a>00810 }
<a name="l00811"></a>00811
<a name="l00812"></a>00812 <span class="comment">/* Generate the foreground mask, pixf, which is at</span>
<a name="l00813"></a>00813 <span class="comment"> * full resolution. These pixels will be ignored when</span>
<a name="l00814"></a>00814 <span class="comment"> * computing the background values. */</span>
<a name="l00815"></a>00815 pixb = <a class="code" href="grayquant_8c.html#ae860cea63ac0db20d92af73cf17f37c7">pixThresholdToBinary</a>(pixs, thresh);
<a name="l00816"></a>00816 pixf = <a class="code" href="leptprotos_8h.html#aac143671b2099c1306d08047e9caf097">pixMorphSequence</a>(pixb, <span class="stringliteral">"d7.1 + d1.7"</span>, 0);
<a name="l00817"></a>00817 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixb);
<a name="l00818"></a>00818
<a name="l00819"></a>00819
<a name="l00820"></a>00820 <span class="comment">/* ------------- Set up the output map pixd --------------- */</span>
<a name="l00821"></a>00821 <span class="comment">/* Generate pixd, which is reduced by the factors (sx, sy). */</span>
<a name="l00822"></a>00822 w = <a class="code" href="leptprotos_8h.html#aa71e0b02548a56e723c76996ab145257">pixGetWidth</a>(pixs);
<a name="l00823"></a>00823 h = <a class="code" href="leptprotos_8h.html#a511e60efcf1d9f3f59b5308ef5f49a06">pixGetHeight</a>(pixs);
<a name="l00824"></a>00824 wd = (w + sx - 1) / sx;
<a name="l00825"></a>00825 hd = (h + sy - 1) / sy;
<a name="l00826"></a>00826 pixd = <a class="code" href="leptprotos_8h.html#a009df4671d39f94b50a0368af210aebe">pixCreate</a>(wd, hd, 8);
<a name="l00827"></a>00827
<a name="l00828"></a>00828 <span class="comment">/* Note: we only compute map values in tiles that are complete.</span>
<a name="l00829"></a>00829 <span class="comment"> * In general, tiles at right and bottom edges will not be</span>
<a name="l00830"></a>00830 <span class="comment"> * complete, and we must fill them in later. */</span>
<a name="l00831"></a>00831 nx = w / sx;
<a name="l00832"></a>00832 ny = h / sy;
<a name="l00833"></a>00833 wpls = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixs);
<a name="l00834"></a>00834 datas = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixs);
<a name="l00835"></a>00835 wpld = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixd);
<a name="l00836"></a>00836 datad = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixd);
<a name="l00837"></a>00837 wplf = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixf);
<a name="l00838"></a>00838 dataf = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixf);
<a name="l00839"></a>00839 <span class="keywordflow">for</span> (i = 0; i < <a class="code" href="pixaatest_8c.html#aa550651119730c08ba0d3ceb1f7c6b5f">ny</a>; i++) {
<a name="l00840"></a>00840 lines = datas + sy * i * wpls;
<a name="l00841"></a>00841 linef = dataf + sy * i * wplf;
<a name="l00842"></a>00842 lined = datad + i * wpld;
<a name="l00843"></a>00843 <span class="keywordflow">for</span> (j = 0; j < <a class="code" href="pixaatest_8c.html#aa4374004b101d3331b46aeef4a143df0">nx</a>; j++) {
<a name="l00844"></a>00844 delx = j * sx;
<a name="l00845"></a>00845 sum = 0;
<a name="l00846"></a>00846 count = 0;
<a name="l00847"></a>00847 <span class="keywordflow">for</span> (k = 0; k < sy; k++) {
<a name="l00848"></a>00848 <span class="keywordflow">for</span> (m = 0; m < sx; m++) {
<a name="l00849"></a>00849 <span class="keywordflow">if</span> (<a class="code" href="arrayaccess_8h.html#ac76be298c81846741bd3106d13a027b2">GET_DATA_BIT</a>(linef + k * wplf, delx + m) == 0) {
<a name="l00850"></a>00850 sum += <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(lines + k * wpls, delx + m);
<a name="l00851"></a>00851 count++;
<a name="l00852"></a>00852 }
<a name="l00853"></a>00853 }
<a name="l00854"></a>00854 }
<a name="l00855"></a>00855 <span class="keywordflow">if</span> (count >= mincount) {
<a name="l00856"></a>00856 val8 = sum / count;
<a name="l00857"></a>00857 <a class="code" href="arrayaccess_8h.html#ab5257b730a14910443765f70e6c3d428">SET_DATA_BYTE</a>(lined, j, val8);
<a name="l00858"></a>00858 }
<a name="l00859"></a>00859 }
<a name="l00860"></a>00860 }
<a name="l00861"></a>00861 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixf);
<a name="l00862"></a>00862
<a name="l00863"></a>00863 <span class="comment">/* If there is an optional mask with fg pixels, erase the previous</span>
<a name="l00864"></a>00864 <span class="comment"> * calculation for the corresponding map pixels, setting the</span>
<a name="l00865"></a>00865 <span class="comment"> * map values to 0. Then, when all the map holes are filled,</span>
<a name="l00866"></a>00866 <span class="comment"> * these erased pixels will be set by the surrounding map values.</span>
<a name="l00867"></a>00867 <span class="comment"> *</span>
<a name="l00868"></a>00868 <span class="comment"> * The calculation here is relatively efficient: for each pixel</span>
<a name="l00869"></a>00869 <span class="comment"> * in pixd (which corresponds to a tile of mask pixels in pixim)</span>
<a name="l00870"></a>00870 <span class="comment"> * we look only at the pixel in pixim that is at the center</span>
<a name="l00871"></a>00871 <span class="comment"> * of the tile. If the mask pixel is ON, we reset the map</span>
<a name="l00872"></a>00872 <span class="comment"> * pixel in pixd to 0, so that it can later be filled in. */</span>
<a name="l00873"></a>00873 pixims = <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00874"></a>00874 <span class="keywordflow">if</span> (pixim && fgpixels) {
<a name="l00875"></a>00875 wim = <a class="code" href="leptprotos_8h.html#aa71e0b02548a56e723c76996ab145257">pixGetWidth</a>(pixim);
<a name="l00876"></a>00876 him = <a class="code" href="leptprotos_8h.html#a511e60efcf1d9f3f59b5308ef5f49a06">pixGetHeight</a>(pixim);
<a name="l00877"></a>00877 dataim = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixim);
<a name="l00878"></a>00878 wplim = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixim);