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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module compare
182 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<p class="navigation-index">[<a href="#CompareImageChannels">CompareImageChannels</a> &bull; <a href="#GetImageChannelDistortion">GetImageChannelDistortion</a> &bull; <a href="#GetImageChannelDistrortion">GetImageChannelDistrortion</a> &bull; <a href="#IsImagesEqual">IsImagesEqual</a> &bull; <a href="#SimilarityImage">SimilarityImage</a>]</p>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/compare
186_8c.html" id="CompareImageChannels">CompareImageChannels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187<div class="doc-section">
188
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]189<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]190
191<p>The format of the CompareImageChannels method is:</p>
192
193<pre class="code">
194 Image *CompareImageChannels(const Image *image,
195 const Image *reconstruct_image,const ChannelType channel,
196 const MetricType metric,double *distortion,ExceptionInfo *exception)
197</pre>
198
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]199<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]200
201<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]202<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203
204<h5>reconstruct_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]205<p>the reconstruct image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206
207<h5>channel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]208<p>the channel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]209
210<h5>metric</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]211<p>the metric.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]212
213<h5>distortion</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]214<p>the computed distortion between the images.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]215
216<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]217<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218
219 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]220<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/compare
221_8c.html" id="GetImageChannelDistortion">GetImageChannelDistortion</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222<div class="doc-section">
223
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]224<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225
226<p>The format of the CompareImageChannels method is:</p>
227
228<pre class="code">
229 MagickBooleanType GetImageChannelDistortion(const Image *image,
230 const Image *reconstruct_image,const ChannelType channel,
231 const MetricType metric,double *distortion,ExceptionInfo *exception)
232</pre>
233
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]234<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]235
236<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]237<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238
239<h5>reconstruct_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]240<p>the reconstruct image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]241
242<h5>channel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]243<p>the channel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244
245<h5>metric</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]246<p>the metric.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]247
248<h5>distortion</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]249<p>the computed distortion between the images.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]250
251<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]252<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]253
254 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]255<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/compare
256_8c.html" id="GetImageChannelDistrortion">GetImageChannelDistrortion</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]257<div class="doc-section">
258
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]259<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]260
261<p>The format of the CompareImageChannels method is:</p>
262
263<pre class="code">
264 double *GetImageChannelDistortions(const Image *image,
265 const Image *reconstruct_image,const MetricType metric,
266 ExceptionInfo *exception)
267</pre>
268
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]270
271<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]272<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]273
274<h5>reconstruct_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]275<p>the reconstruct image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]276
277<h5>metric</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]278<p>the metric.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279
280<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]281<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]282
283 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]284<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/compare
285_8c.html" id="IsImagesEqual">IsImagesEqual</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]286<div class="doc-section">
287
288<p>IsImagesEqual() measures the difference between colors at each pixel location of two images. A value other than 0 means the colors match exactly. Otherwise an error measure is computed by summing over all pixels in an image the distance squared in RGB space between each image pixel and its corresponding pixel in the reconstruct image. The error measure is assigned to these image members:</p>
289
290<pre class="text">
291 o mean_error_per_pixel: The mean error for any single pixel in
292 the image.
293</pre>
294
295<h5>normalized_mean_error</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]296<p>The normalized mean quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]297
298<h5>normalized_maximum_error</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]299<p>The normalized maximum quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in your image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]300
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]301<p>A small normalized mean square error, accessed as image->normalized_mean_error, suggests the images are very similar in spatial layout and color.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]302
303<p>The format of the IsImagesEqual method is:</p>
304
305<pre class="code">
306 MagickBooleanType IsImagesEqual(Image *image,
307 const Image *reconstruct_image)
308</pre>
309
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]310<p>A description of each parameter follows.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]311
312<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]313<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]314
315<h5>reconstruct_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]316<p>the reconstruct image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]317
318 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]319<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/compare
320_8c.html" id="SimilarityImage">SimilarityImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321<div class="doc-section">
322
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]323<p>SimilarityImage() compares the reference image of the image and returns the best match offset. In addition, it returns a similarity image such that an exact match location is completely white and if none of the pixels match, black, otherwise some gray level in-between.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324
325<p>The format of the SimilarityImageImage method is:</p>
326
327<pre class="code">
328 Image *SimilarityImage(const Image *image,const Image *reference,
329 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
330</pre>
331
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]332<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]333
334<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]335<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]336
337<h5>reference</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]338<p>find an area of the image that closely resembles this image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]339
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]340<p>o the best match offset of the reference image within the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]341
342<h5>similarity</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]343<p>the computed similarity between the images.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]344
345<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]346<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]347
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