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209<div class="main">
210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<h1>Module compare Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]212<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="CompareImageChannels">CompareImageChannels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]215<div class="doc-section">
216
217<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
218
219<p>The format of the CompareImageChannels method is:</p>
220
221<pre class="code">
222 Image *CompareImageChannels(const Image *image,
223 const Image *reconstruct_image,const ChannelType channel,
224 const MetricType metric,double *distortion,ExceptionInfo *exception)
225</pre>
226
227<p>A description of each parameter follows:</p>
228
229<h5>image</h5>
230<p>the image.</p>
231
232<h5>reconstruct_image</h5>
233<p>the reconstruct image.</p>
234
235<h5>channel</h5>
236<p>the channel.</p>
237
238<h5>metric</h5>
239<p>the metric.</p>
240
241<h5>distortion</h5>
242<p>the computed distortion between the images.</p>
243
244<h5>exception</h5>
245<p>return any errors or warnings in this structure.</p>
246
247 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]248<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistortion">GetImageChannelDistortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]249<div class="doc-section">
250
251<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
252
253<p>The format of the CompareImageChannels method is:</p>
254
255<pre class="code">
256 MagickBooleanType GetImageChannelDistortion(const Image *image,
257 const Image *reconstruct_image,const ChannelType channel,
258 const MetricType metric,double *distortion,ExceptionInfo *exception)
259</pre>
260
261<p>A description of each parameter follows:</p>
262
263<h5>image</h5>
264<p>the image.</p>
265
266<h5>reconstruct_image</h5>
267<p>the reconstruct image.</p>
268
269<h5>channel</h5>
270<p>the channel.</p>
271
272<h5>metric</h5>
273<p>the metric.</p>
274
275<h5>distortion</h5>
276<p>the computed distortion between the images.</p>
277
278<h5>exception</h5>
279<p>return any errors or warnings in this structure.</p>
280
281 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]282<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistrortion">GetImageChannelDistrortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]283<div class="doc-section">
284
285<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
286
287<p>The format of the CompareImageChannels method is:</p>
288
289<pre class="code">
290 double *GetImageChannelDistortions(const Image *image,
291 const Image *reconstruct_image,const MetricType metric,
292 ExceptionInfo *exception)
293</pre>
294
295<p>A description of each parameter follows:</p>
296
297<h5>image</h5>
298<p>the image.</p>
299
300<h5>reconstruct_image</h5>
301<p>the reconstruct image.</p>
302
303<h5>metric</h5>
304<p>the metric.</p>
305
306<h5>exception</h5>
307<p>return any errors or warnings in this structure.</p>
308
309 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]310<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="IsImagesEqual">IsImagesEqual</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]311<div class="doc-section">
312
313<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>
314
315<pre class="text">
316 o mean_error_per_pixel: The mean error for any single pixel in
317 the image.
318</pre>
319
320<h5>normalized_mean_error</h5>
321<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>
322
323<h5>normalized_maximum_error</h5>
324<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>
325
326<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>
327
328<p>The format of the IsImagesEqual method is:</p>
329
330<pre class="code">
331 MagickBooleanType IsImagesEqual(Image *image,
332 const Image *reconstruct_image)
333</pre>
334
335<p>A description of each parameter follows.</p>
336
337<h5>image</h5>
338<p>the image.</p>
339
340<h5>reconstruct_image</h5>
341<p>the reconstruct image.</p>
342
343 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]344<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="SimilarityImage">SimilarityImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]345<div class="doc-section">
346
347<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>
348
349<p>The format of the SimilarityImageImage method is:</p>
350
351<pre class="code">
352 Image *SimilarityImage(const Image *image,const Image *reference,
353 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
354</pre>
355
356<p>A description of each parameter follows:</p>
357
358<h5>image</h5>
359<p>the image.</p>
360
361<h5>reference</h5>
362<p>find an area of the image that closely resembles this image.</p>
363
364<p>o the best match offset of the reference image within the image.</p>
365
366<h5>similarity</h5>
367<p>the computed similarity between the images.</p>
368
369<h5>exception</h5>
370<p>return any errors or warnings in this structure.</p>
371
372 </div>
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