-
Notifications
You must be signed in to change notification settings - Fork 56
/
imshow_numeric.html
211 lines (174 loc) · 5.42 KB
/
imshow_numeric.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
<html>
<head>
<title>
IMSHOW_NUMERIC - Display a Numeric Array as a Grayscale Image
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
IMSHOW_NUMERIC <br> Display a Numeric Array as a Grayscale Image
</h1>
<hr>
<p>
<b>IMSHOW_NUMERIC</b>
is a MATLAB program which
displays a numeric array as a grayscale image.
</p>
<p>
MATLAB's Image Processing Toolbox works with images stored as 2D or 3D arrays
of a special type, typically "uint8", that is, an unsigned 8 bit integer whose
values are between 0 and 255.
</p>
<p>
Many image processing algorithms require numeric operations on real data
(which MATLAB typically types as "double", and return values with fractional
parts, in arbitrary ranges that might include negative values.
</p>
<p>
Thus, if one wants to carry out simple numeric versions of image processing
algorithms, one must repeatedly convert numeric data to image data to view it
using MATLAB's <b>imshow()</b> command, for instance.
</p>
<p>
This function, instead, allows a user to display a numeric array by passing
it directly as the argument to a function called <b>imshow_numeric()</b>, which
makes a quick and simple conversion of the numeric data to
a format of the appropriate type and range for display.
</p>
<p>
The current version of the program only handles grayscale data, that is,
a 2D numeric array.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>imshow_numeric</b> ( <i>A</i> )
</blockquote>
where
<ul>
<li>
<b>A</b> is an <b>M</b> by <b>N</b> numeric array.
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>IMSHOW_NUMERIC</b> is available in
<a href = "../../m_src/imshow_numeric/imshow_numeric.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/image_components/image_components.html">
IMAGE_COMPONENTS</a>,
a MATLAB library which
seeks the connected "nonzero" or "nonblack" components of an image or integer vector,
array or 3D block.
</p>
<p>
<a href = "../../m_src/image_contrast/image_contrast.html">
IMAGE_CONTRAST</a>,
a MATLAB program which
applies image processing techniques to increase the contrast in an image.
</p>
<p>
<a href = "../../m_src/image_denoise/image_denoise.html">
IMAGE_DENOISE</a>,
MATLAB programs which
apply image processing techniques to remove noise from an image.
</p>
<p>
<a href = "../../m_src/image_edge/image_edge.html">
IMAGE_EDGE</a>,
a MATLAB library which
demonstrates a simple procedure for edge detection in images.
</p>
<p>
<a href = "../../m_src/image_noise/image_noise.html">
IMAGE_NOISE</a>,
MATLAB programs which
add noise to an image.
</p>
<p>
<a href = "../../m_src/image_quantization/image_quantization.html">
IMAGE_QUANTIZATION</a>,
a MATLAB library which
demonstrates how the KMEANS algorithm can be used to reduce the number
of colors or shades of gray in an image.
</p>
<p>
<a href = "../../m_src/image_rgb_to_gray/image_rgb_to_gray.html">
IMAGE_RGB_TO_GRAY</a>,
MATLAB programs which
makes a grayscale version of an RGB image.
</p>
<p>
<a href = "../../m_src/image_threshold/image_threshold.html">
IMAGE_THRESHOLD</a>,
MATLAB programs which
make a black and white version of a grayscale image by setting all pixels
below or above a threshold value to black or white.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
MathWorks documentation for the Image Processing Toolbox is available at
<a href = "http://www.mathworks.com/access/helpdesk/help/pdf_doc/images/images_tb.pdf">
http://www.mathworks.com/access/helpdesk/help/pdf_doc/images/images_tb.pdf</a>.
</p>
<p>
<ul>
<li>
Jonas Gomes, Luiz Velho,<br>
Image Processing for Computer Graphics,<br>
Springer, 1997,<br>
ISBN: 0387948546,<br>
LC: T385.G65.
</li>
<li>
William Pratt,<br>
Digital Image Processing,<br>
Second Edition,<br>
Wiley, 1991,<br>
ISBN13: 978-0471857662,<br>
LC: TA1632.P7.
</li>
</ul>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "imshow_numeric.m">imshow_numeric.m</a>,
sets up appropriate scaling and conversion to the uint8 type so that
a numeric 2D array can be displayed as a grayscale image.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 21 March 2011.
</i>
<!-- John Burkardt -->
</body>
</html>