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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectname">Leptonica <span id="projectnumber">1.68</span></div>
<div id="projectbrief">C Image Processing Library</div>
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<h1>baseline.c File Reference</h1> </div>
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<p>Find text baselines; determine and remove local skew.
<a href="#_details">More...</a></p>
<div class="textblock"><code>#include <stdio.h></code><br/>
<code>#include <stdlib.h></code><br/>
<code>#include <math.h></code><br/>
<code>#include "<a class="el" href="allheaders_8h_source.html">allheaders.h</a>"</code><br/>
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<p><a href="baseline_8c_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="define-members"></a>
Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#abd9fad53a1db5c8748706f009f4f2976">DEBUG_PLOT</a>   0</td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_numa.html">NUMA</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a715843619c2153a99950a55100ccd2ba">pixFindBaselines</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="struct_pta.html">PTA</a> **ppta, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> debug)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#afae733b08bc9ae9d90f84af551e55921">pixDeskewLocal</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> nslices, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsweep, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsearch, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweeprange, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweepdelta, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> minbsdelta)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#abb99f4604ebf3316405c73cafcb17d58">pixGetLocalSkewTransform</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> nslices, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsweep, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsearch, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweeprange, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweepdelta, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> minbsdelta, <a class="el" href="struct_pta.html">PTA</a> **pptas, <a class="el" href="struct_pta.html">PTA</a> **pptad)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_numa.html">NUMA</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a8191d6360b6b277edef9bcc4bf44c285">pixGetLocalSkewAngles</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> nslices, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsweep, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> redsearch, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweeprange, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> sweepdelta, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> minbsdelta, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> *pa, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> *pb)</td></tr>
<tr><td colspan="2"><h2><a name="var-members"></a>
Variables</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#ad87dc51a46b9a6bb3ff67612376ea9a3">MIN_DIST_IN_PEAK</a> = 35</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a002d675d5c683b48dea0fcd196f6c2a6">PEAK_THRESHOLD_RATIO</a> = 20</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a7256786b3d32c060d06c793c22ee1223">ZERO_THRESHOLD_RATIO</a> = 100</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#ae1427d524c70bd6c726342da1e259281">DEFAULT_SLICES</a> = 10</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a39a008f08812f1bee2cb524321f5e3f6">DEFAULT_SWEEP_REDUCTION</a> = 2</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a038d6bd74217e38b0b5fb1e067c51860">DEFAULT_BS_REDUCTION</a> = 1</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a5faa1c0a18090b4819f2ca824a4baf14">DEFAULT_SWEEP_RANGE</a> = 5.</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#aeb08cefe7174b79cf6a53b57e31e537b">DEFAULT_SWEEP_DELTA</a> = 1.</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a27b017908e5e9ac5d59c40117daa200d">DEFAULT_MINBS_DELTA</a> = 0.01</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a75c867a45cef3fa8dd2361d151db9f55">OVERLAP_FRACTION</a> = 0.5</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="baseline_8c.html#a2b8ce97eeaa57c06b7553b1db5001583">MIN_ALLOWED_CONFIDENCE</a> = 3.0</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Find text baselines; determine and remove local skew. </p>
<div class="fragment"><pre class="fragment"> Locate text <a class="code" href="bmf_8c.html#a18a519a9b98a53af96ac9b1275368a3e">baselines</a> in an <a class="code" href="colorquant__reg_8c.html#aabec89bef1d1e1f9faf4e7d2e685c317">image</a>
<a class="code" href="struct_numa.html">NUMA</a> *<a class="code" href="baseline_8c.html#a715843619c2153a99950a55100ccd2ba">pixFindBaselines</a>()
Projective transform to remove local skew
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="baseline_8c.html#afae733b08bc9ae9d90f84af551e55921">pixDeskewLocal</a>()
Determine local skew
<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="baseline_8c.html#abb99f4604ebf3316405c73cafcb17d58">pixGetLocalSkewTransform</a>()
<a class="code" href="struct_numa.html">NUMA</a> *<a class="code" href="baseline_8c.html#a8191d6360b6b277edef9bcc4bf44c285">pixGetLocalSkewAngles</a>()
We have two apparently different functions here:
- finding <a class="code" href="bmf_8c.html#a18a519a9b98a53af96ac9b1275368a3e">baselines</a>
- finding a projective transform to remove keystone warping
The function <a class="code" href="baseline_8c.html#a8191d6360b6b277edef9bcc4bf44c285">pixGetLocalSkewAngles</a>() returns an <a class="code" href="struct_numa.html#a61817e4e267f58a697b701a9728db6fe">array</a> of angles,
one for each raster line, and the <a class="code" href="bmf_8c.html#a18a519a9b98a53af96ac9b1275368a3e">baselines</a> of the text lines
should intersect the left edge of the <a class="code" href="colorquant__reg_8c.html#aabec89bef1d1e1f9faf4e7d2e685c317">image</a> with that angle.
</pre></div>
<p>Definition in file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
</div><hr/><h2>Define Documentation</h2>
<a class="anchor" id="abd9fad53a1db5c8748706f009f4f2976"></a><!-- doxytag: member="baseline.c::DEBUG_PLOT" ref="abd9fad53a1db5c8748706f009f4f2976" args="" -->
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<td class="memname">#define DEBUG_PLOT   0</td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00043">43</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="a715843619c2153a99950a55100ccd2ba"></a><!-- doxytag: member="baseline.c::pixFindBaselines" ref="a715843619c2153a99950a55100ccd2ba" args="(PIX *pixs, PTA **ppta, l_int32 debug)" -->
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<td class="memname"><a class="el" href="struct_numa.html">NUMA</a>* pixFindBaselines </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pta.html">PTA</a> ** </td>
<td class="paramname"><em>ppta</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<p><a class="el" href="baseline_8c.html#a715843619c2153a99950a55100ccd2ba">pixFindBaselines()</a></p>
<p>Input: pixs (1 bpp) &pta (<optional return>=""> pairs of pts corresponding to approx. ends of each text line) debug (usually 0; set to 1 for debugging output) Return: na (of baseline y values), or null on error</p>
<p>Notes: (1) Input binary image must have text lines already aligned horizontally. This can be done by either rotating the image with <a class="el" href="leptprotos_8h.html#a3a5f96eb65f6adf26108dcb983c3ca24">pixDeskew()</a>, or, if a projective transform is required, by doing <a class="el" href="baseline_8c.html#afae733b08bc9ae9d90f84af551e55921">pixDeskewLocal()</a> first. (2) Input null for &pta if you don't want this returned. The pta will come in pairs of points (left and right end of each baseline). (3) Caution: this will not work properly on text with multiple columns, where the lines are not aligned between columns. If there are multiple columns, they should be extracted separately before finding the baselines. (4) This function constructs different types of output for baselines; namely, a set of raster line values and a set of end points of each baseline. (5) This function was designed to handle short and long text lines without using dangerous thresholds on the peak heights. It does this by combining the differential signal with a morphological analysis of the locations of the text lines. One can also combine this data to normalize the peak heights, by weighting the differential signal in the region of each baseline by the inverse of the width of the text line found there. (6) There are various debug sections that can be turned on with the debug flag. </p>
<p>Definition at line <a class="el" href="baseline_8c_source.html#l00106">106</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>References <a class="el" href="boxbasic_8c_source.html#l00436">boxaDestroy()</a>, <a class="el" href="boxbasic_8c_source.html#l00682">boxaGetBoxGeometry()</a>, <a class="el" href="boxbasic_8c_source.html#l00570">boxaGetCount()</a>, <a class="el" href="boxfunc2_8c_source.html#l00516">boxaSort()</a>, <a class="el" href="boxfunc2_8c_source.html#l00070">boxaTransform()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="environ_8h_source.html#l00179">FALSE</a>, <a class="el" href="environ_8h_source.html#l00216">FREE</a>, <a class="el" href="gplot_8h_source.html#l00030">GPLOT_POINTS</a>, <a class="el" href="gplot_8h_source.html#l00042">GPLOT_X11</a>, <a class="el" href="gplot_8c_source.html#l00241">gplotAddPlot()</a>, <a class="el" href="gplot_8c_source.html#l00126">gplotCreate()</a>, <a class="el" href="gplot_8c_source.html#l00185">gplotDestroy()</a>, <a class="el" href="gplot_8c_source.html#l00349">gplotMakeOutput()</a>, <a class="el" href="gplot_8c_source.html#l00535">gplotSimple1()</a>, <a class="el" href="imageio_8h_source.html#l00038">IFF_PNG</a>, <a class="el" href="environ_8h_source.html#l00159">L_ABS</a>, <a class="el" href="pix_8h_source.html#l00615">L_SORT_BY_Y</a>, <a class="el" href="pix_8h_source.html#l00609">L_SORT_INCREASING</a>, <a class="el" href="baseline_8c_source.html#l00047">MIN_DIST_IN_PEAK</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="numabasic_8c_source.html#l00403">numaAddNumber()</a>, <a class="el" href="numabasic_8c_source.html#l00177">numaCreate()</a>, <a class="el" href="numabasic_8c_source.html#l00292">numaDestroy()</a>, <a class="el" href="numabasic_8c_source.html#l00557">numaGetCount()</a>, <a class="el" href="numabasic_8c_source.html#l00738">numaGetIArray()</a>, <a class="el" href="numabasic_8c_source.html#l00647">numaGetIValue()</a>, <a class="el" href="numafunc1_8c_source.html#l00354">numaGetMax()</a>, <a class="el" href="baseline_8c_source.html#l00050">PEAK_THRESHOLD_RATIO</a>, <a class="el" href="conncomp_8c_source.html#l00132">pixConnComp()</a>, <a class="el" href="pixconv_8c_source.html#l02453">pixConvertTo32()</a>, <a class="el" href="pix3_8c_source.html#l01532">pixCountPixelsByRow()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="writefile_8c_source.html#l00677">pixDisplay()</a>, <a class="el" href="pix1_8c_source.html#l00833">pixGetHeight()</a>, <a class="el" href="pix1_8c_source.html#l00803">pixGetWidth()</a>, <a class="el" href="morphseq_8c_source.html#l00118">pixMorphSequence()</a>, <a class="el" href="graphics_8c_source.html#l00962">pixRenderLineArb()</a>, <a class="el" href="writefile_8c_source.html#l00190">pixWrite()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="ptabasic_8c_source.html#l00262">ptaAddPt()</a>, <a class="el" href="ptabasic_8c_source.html#l00083">ptaCreate()</a>, <a class="el" href="ptabasic_8c_source.html#l00346">ptaGetCount()</a>, <a class="el" href="ptabasic_8c_source.html#l00397">ptaGetIPt()</a>, <a class="el" href="environ_8h_source.html#l00175">TRUE</a>, <a class="el" href="affine__reg_8c_source.html#l00032">x1</a>, <a class="el" href="affine__reg_8c_source.html#l00034">x2</a>, <a class="el" href="affine__reg_8c_source.html#l00033">y1</a>, <a class="el" href="affine__reg_8c_source.html#l00035">y2</a>, and <a class="el" href="baseline_8c_source.html#l00051">ZERO_THRESHOLD_RATIO</a>.</p>
<p>Referenced by <a class="el" href="baselinetest_8c_source.html#l00026">main()</a>.</p>
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<td class="paramname"><em>pixs</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>nslices</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<p><a class="el" href="baseline_8c.html#afae733b08bc9ae9d90f84af551e55921">pixDeskewLocal()</a></p>
<p>Input: pixs nslices (the number of horizontal overlapping slices; must be larger than 1 and not exceed 20; use 0 for default) redsweep (sweep reduction factor: 1, 2, 4 or 8; use 0 for default value) redsearch (search reduction factor: 1, 2, 4 or 8, and not larger than redsweep; use 0 for default value) sweeprange (half the full range, assumed about 0; in degrees; use 0.0 for default value) sweepdelta (angle increment of sweep; in degrees; use 0.0 for default value) minbsdelta (min binary search increment angle; in degrees; use 0.0 for default value) Return: pixd, or null on error</p>
<p>Notes: (1) This function allows deskew of a page whose skew changes approximately linearly with vertical position. It uses a projective tranform that in effect does a differential shear about the LHS of the page, and makes all text lines horizontal. (2) The origin of the keystoning can be either a cheap document feeder that rotates the page as it is passed through, or a camera image taken from either the left or right side of the vertical. (3) The image transformation is a projective warping, not a rotation. Apart from this function, the text lines must be properly aligned vertically with respect to each other. This can be done by pre-processing the page; e.g., by rotating or horizontally shearing it. Typically, this can be achieved by vertically aligning the page edge. </p>
<p>Definition at line <a class="el" href="baseline_8c_source.html#l00295">295</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>References <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix_8h_source.html#l00694">L_BRING_IN_WHITE</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>, <a class="el" href="projective_8c_source.html#l00128">pixProjectiveSampledPta()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, and <a class="el" href="ptabasic_8c_source.html#l00156">ptaDestroy()</a>.</p>
<p>Referenced by <a class="el" href="baselinetest_8c_source.html#l00026">main()</a>.</p>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
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<p><a class="el" href="baseline_8c.html#abb99f4604ebf3316405c73cafcb17d58">pixGetLocalSkewTransform()</a></p>
<p>Input: pixs nslices (the number of horizontal overlapping slices; must be larger than 1 and not exceed 20; use 0 for default) redsweep (sweep reduction factor: 1, 2, 4 or 8; use 0 for default value) redsearch (search reduction factor: 1, 2, 4 or 8, and not larger than redsweep; use 0 for default value) sweeprange (half the full range, assumed about 0; in degrees; use 0.0 for default value) sweepdelta (angle increment of sweep; in degrees; use 0.0 for default value) minbsdelta (min binary search increment angle; in degrees; use 0.0 for default value) &ptas (<return> 4 points in the source) &ptad (<return> the corresponding 4 pts in the dest) Return: 0 if OK, 1 on error</p>
<p>Notes: (1) This generates two pairs of points in the src, each pair corresponding to a pair of points that would lie along the same raster line in a transformed (dewarped) image. (2) The sets of 4 src and 4 dest points returned by this function can then be used, in a projective or bilinear transform, to remove keystoning in the src. </p>
<p>Definition at line <a class="el" href="baseline_8c_source.html#l00361">361</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>References <a class="el" href="baseline_8c_source.html#l00056">DEFAULT_BS_REDUCTION</a>, <a class="el" href="baseline_8c_source.html#l00059">DEFAULT_MINBS_DELTA</a>, <a class="el" href="baseline_8c_source.html#l00054">DEFAULT_SLICES</a>, <a class="el" href="baseline_8c_source.html#l00058">DEFAULT_SWEEP_DELTA</a>, <a class="el" href="baseline_8c_source.html#l00057">DEFAULT_SWEEP_RANGE</a>, <a class="el" href="baseline_8c_source.html#l00055">DEFAULT_SWEEP_REDUCTION</a>, <a class="el" href="environ_8h_source.html#l00251">ERROR_INT</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="numabasic_8c_source.html#l00292">numaDestroy()</a>, <a class="el" href="numabasic_8c_source.html#l00614">numaGetFValue()</a>, <a class="el" href="pix1_8c_source.html#l00833">pixGetHeight()</a>, <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, <a class="el" href="pix1_8c_source.html#l00803">pixGetWidth()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="ptabasic_8c_source.html#l00262">ptaAddPt()</a>, and <a class="el" href="ptabasic_8c_source.html#l00083">ptaCreate()</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00295">pixDeskewLocal()</a>.</p>
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<p><a class="el" href="baseline_8c.html#a8191d6360b6b277edef9bcc4bf44c285">pixGetLocalSkewAngles()</a></p>
<p>Input: pixs nslices (the number of horizontal overlapping slices; must be larger than 1 and not exceed 20; use 0 for default) redsweep (sweep reduction factor: 1, 2, 4 or 8; use 0 for default value) redsearch (search reduction factor: 1, 2, 4 or 8, and not larger than redsweep; use 0 for default value) sweeprange (half the full range, assumed about 0; in degrees; use 0.0 for default value) sweepdelta (angle increment of sweep; in degrees; use 0.0 for default value) minbsdelta (min binary search increment angle; in degrees; use 0.0 for default value) &a (<optional return>=""> slope of skew as fctn of y) &b (<optional return>=""> intercept at y=0 of skew as fctn of y) Return: naskew, or null on error</p>
<p>Notes: (1) The local skew is measured in a set of overlapping strips. We then do a least square linear fit parameters to get the slope and intercept parameters a and b in skew-angle = a * y + b (degrees) for the local skew as a function of raster line y. This is then used to make naskew, which can be interpreted as the computed skew angle (in degrees) at the left edge of each raster line. (2) naskew can then be used to find the baselines of text, because each text line has a baseline that should intersect the left edge of the image with the angle given by this array, evaluated at the raster line of intersection. </p>
<p>Definition at line <a class="el" href="baseline_8c_source.html#l00476">476</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>References <a class="el" href="boxbasic_8c_source.html#l00133">boxCreate()</a>, <a class="el" href="boxbasic_8c_source.html#l00242">boxDestroy()</a>, <a class="el" href="baseline_8c_source.html#l00056">DEFAULT_BS_REDUCTION</a>, <a class="el" href="baseline_8c_source.html#l00059">DEFAULT_MINBS_DELTA</a>, <a class="el" href="baseline_8c_source.html#l00054">DEFAULT_SLICES</a>, <a class="el" href="baseline_8c_source.html#l00058">DEFAULT_SWEEP_DELTA</a>, <a class="el" href="baseline_8c_source.html#l00057">DEFAULT_SWEEP_RANGE</a>, <a class="el" href="baseline_8c_source.html#l00055">DEFAULT_SWEEP_REDUCTION</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="gplot_8h_source.html#l00030">GPLOT_POINTS</a>, <a class="el" href="gplot_8h_source.html#l00042">GPLOT_X11</a>, <a class="el" href="gplot_8c_source.html#l00241">gplotAddPlot()</a>, <a class="el" href="gplot_8c_source.html#l00126">gplotCreate()</a>, <a class="el" href="gplot_8c_source.html#l00185">gplotDestroy()</a>, <a class="el" href="gplot_8c_source.html#l00349">gplotMakeOutput()</a>, <a class="el" href="environ_8h_source.html#l00155">L_MAX</a>, <a class="el" href="environ_8h_source.html#l00151">L_MIN</a>, <a class="el" href="baseline_8c_source.html#l00065">MIN_ALLOWED_CONFIDENCE</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="numabasic_8c_source.html#l00403">numaAddNumber()</a>, <a class="el" href="numabasic_8c_source.html#l00177">numaCreate()</a>, <a class="el" href="numabasic_8c_source.html#l00292">numaDestroy()</a>, <a class="el" href="baseline_8c_source.html#l00062">OVERLAP_FRACTION</a>, <a class="el" href="pix5_8c_source.html#l00698">pixClipRectangle()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="skew_8c_source.html#l00489">pixFindSkewSweepAndSearch()</a>, <a class="el" href="pix1_8c_source.html#l00833">pixGetHeight()</a>, <a class="el" href="pix1_8c_source.html#l00803">pixGetWidth()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="ptabasic_8c_source.html#l00262">ptaAddPt()</a>, <a class="el" href="ptabasic_8c_source.html#l00083">ptaCreate()</a>, <a class="el" href="ptabasic_8c_source.html#l00156">ptaDestroy()</a>, <a class="el" href="ptabasic_8c_source.html#l00456">ptaGetArrays()</a>, <a class="el" href="ptabasic_8c_source.html#l00346">ptaGetCount()</a>, and <a class="el" href="ptafunc1_8c_source.html#l00795">ptaGetLinearLSF()</a>.</p>
<p>Referenced by <a class="el" href="baselinetest_8c_source.html#l00026">main()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<hr/><h2>Variable Documentation</h2>
<a class="anchor" id="ad87dc51a46b9a6bb3ff67612376ea9a3"></a><!-- doxytag: member="baseline.c::MIN_DIST_IN_PEAK" ref="ad87dc51a46b9a6bb3ff67612376ea9a3" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="baseline_8c.html#ad87dc51a46b9a6bb3ff67612376ea9a3">MIN_DIST_IN_PEAK</a> = 35<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00047">47</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00106">pixFindBaselines()</a>.</p>
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<a class="anchor" id="a002d675d5c683b48dea0fcd196f6c2a6"></a><!-- doxytag: member="baseline.c::PEAK_THRESHOLD_RATIO" ref="a002d675d5c683b48dea0fcd196f6c2a6" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="baseline_8c.html#a002d675d5c683b48dea0fcd196f6c2a6">PEAK_THRESHOLD_RATIO</a> = 20<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00050">50</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00106">pixFindBaselines()</a>.</p>
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<a class="anchor" id="a7256786b3d32c060d06c793c22ee1223"></a><!-- doxytag: member="baseline.c::ZERO_THRESHOLD_RATIO" ref="a7256786b3d32c060d06c793c22ee1223" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="baseline_8c.html#a7256786b3d32c060d06c793c22ee1223">ZERO_THRESHOLD_RATIO</a> = 100<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00051">51</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00106">pixFindBaselines()</a>.</p>
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<a class="anchor" id="ae1427d524c70bd6c726342da1e259281"></a><!-- doxytag: member="baseline.c::DEFAULT_SLICES" ref="ae1427d524c70bd6c726342da1e259281" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="baseline_8c.html#ae1427d524c70bd6c726342da1e259281">DEFAULT_SLICES</a> = 10<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00054">54</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="a39a008f08812f1bee2cb524321f5e3f6"></a><!-- doxytag: member="baseline.c::DEFAULT_SWEEP_REDUCTION" ref="a39a008f08812f1bee2cb524321f5e3f6" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="skew_8c.html#a39a008f08812f1bee2cb524321f5e3f6">DEFAULT_SWEEP_REDUCTION</a> = 2<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00055">55</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="a038d6bd74217e38b0b5fb1e067c51860"></a><!-- doxytag: member="baseline.c::DEFAULT_BS_REDUCTION" ref="a038d6bd74217e38b0b5fb1e067c51860" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="el" href="skew_8c.html#a038d6bd74217e38b0b5fb1e067c51860">DEFAULT_BS_REDUCTION</a> = 1<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00056">56</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="a5faa1c0a18090b4819f2ca824a4baf14"></a><!-- doxytag: member="baseline.c::DEFAULT_SWEEP_RANGE" ref="a5faa1c0a18090b4819f2ca824a4baf14" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> <a class="el" href="skew_8c.html#a5faa1c0a18090b4819f2ca824a4baf14">DEFAULT_SWEEP_RANGE</a> = 5.<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00057">57</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="aeb08cefe7174b79cf6a53b57e31e537b"></a><!-- doxytag: member="baseline.c::DEFAULT_SWEEP_DELTA" ref="aeb08cefe7174b79cf6a53b57e31e537b" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> <a class="el" href="skew_8c.html#aeb08cefe7174b79cf6a53b57e31e537b">DEFAULT_SWEEP_DELTA</a> = 1.<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00058">58</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="a27b017908e5e9ac5d59c40117daa200d"></a><!-- doxytag: member="baseline.c::DEFAULT_MINBS_DELTA" ref="a27b017908e5e9ac5d59c40117daa200d" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> <a class="el" href="skew_8c.html#a27b017908e5e9ac5d59c40117daa200d">DEFAULT_MINBS_DELTA</a> = 0.01<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00059">59</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>, and <a class="el" href="baseline_8c_source.html#l00361">pixGetLocalSkewTransform()</a>.</p>
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<a class="anchor" id="a75c867a45cef3fa8dd2361d151db9f55"></a><!-- doxytag: member="baseline.c::OVERLAP_FRACTION" ref="a75c867a45cef3fa8dd2361d151db9f55" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> <a class="el" href="baseline_8c.html#a75c867a45cef3fa8dd2361d151db9f55">OVERLAP_FRACTION</a> = 0.5<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00062">62</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>.</p>
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<a class="anchor" id="a2b8ce97eeaa57c06b7553b1db5001583"></a><!-- doxytag: member="baseline.c::MIN_ALLOWED_CONFIDENCE" ref="a2b8ce97eeaa57c06b7553b1db5001583" args="" -->
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<td class="memname">const <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> <a class="el" href="skew_8c.html#a2b8ce97eeaa57c06b7553b1db5001583">MIN_ALLOWED_CONFIDENCE</a> = 3.0<code> [static]</code></td>
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<p>Definition at line <a class="el" href="baseline_8c_source.html#l00065">65</a> of file <a class="el" href="baseline_8c_source.html">baseline.c</a>.</p>
<p>Referenced by <a class="el" href="baseline_8c_source.html#l00476">pixGetLocalSkewAngles()</a>.</p>
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