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gerrit-public.fairphone.software / platform / external / ImageMagick / 06f63f2865009003d39425e264f6066d7f0b8875 / . / www / api / compare.html
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cristy20398432011-08-11 01:31:50 +0000[diff] [blame]239<h1>Module compare Methods</h1>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]240<p class="navigation-index">[<a href="compare.html#CompareImageChannels">CompareImageChannels</a> &bull; <a href="compare.html#GetImageChannelDistortion">GetImageChannelDistortion</a> &bull; <a href="compare.html#GetImageChannelDistrortion">GetImageChannelDistrortion</a> &bull; <a href="compare.html#IsImagesEqual">IsImagesEqual</a> &bull; <a href="compare.html#SimilarityImage">SimilarityImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]241
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]242<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="CompareImageChannels">CompareImageChannels</a></h2>
243<div class="doc-section">
244
245<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
246
247<p>The format of the CompareImageChannels method is:</p>
248
249<pre class="code">
250 Image *CompareImageChannels(const Image *image,
251 const Image *reconstruct_image,const ChannelType channel,
252 const MetricType metric,double *distortion,ExceptionInfo *exception)
253</pre>
254
255<p>A description of each parameter follows:</p>
256
257<h5>image</h5>
258<p>the image.</p>
259
260<h5>reconstruct_image</h5>
261<p>the reconstruct image.</p>
262
263<h5>channel</h5>
264<p>the channel.</p>
265
266<h5>metric</h5>
267<p>the metric.</p>
268
269<h5>distortion</h5>
270<p>the computed distortion between the images.</p>
271
272<h5>exception</h5>
273<p>return any errors or warnings in this structure.</p>
274
275 </div>
276<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistortion">GetImageChannelDistortion</a></h2>
277<div class="doc-section">
278
279<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
280
281<p>The format of the CompareImageChannels method is:</p>
282
283<pre class="code">
284 MagickBooleanType GetImageChannelDistortion(const Image *image,
285 const Image *reconstruct_image,const ChannelType channel,
286 const MetricType metric,double *distortion,ExceptionInfo *exception)
287</pre>
288
289<p>A description of each parameter follows:</p>
290
291<h5>image</h5>
292<p>the image.</p>
293
294<h5>reconstruct_image</h5>
295<p>the reconstruct image.</p>
296
297<h5>channel</h5>
298<p>the channel.</p>
299
300<h5>metric</h5>
301<p>the metric.</p>
302
303<h5>distortion</h5>
304<p>the computed distortion between the images.</p>
305
306<h5>exception</h5>
307<p>return any errors or warnings in this structure.</p>
308
309 </div>
310<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistrortion">GetImageChannelDistrortion</a></h2>
311<div class="doc-section">
312
313<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
314
315<p>The format of the CompareImageChannels method is:</p>
316
317<pre class="code">
318 double *GetImageChannelDistortions(const Image *image,
319 const Image *reconstruct_image,const MetricType metric,
320 ExceptionInfo *exception)
321</pre>
322
323<p>A description of each parameter follows:</p>
324
325<h5>image</h5>
326<p>the image.</p>
327
328<h5>reconstruct_image</h5>
329<p>the reconstruct image.</p>
330
331<h5>metric</h5>
332<p>the metric.</p>
333
334<h5>exception</h5>
335<p>return any errors or warnings in this structure.</p>
336
337 </div>
338<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="IsImagesEqual">IsImagesEqual</a></h2>
339<div class="doc-section">
340
341<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>
342
343<pre class="text">
344 o mean_error_per_pixel: The mean error for any single pixel in
345 the image.
346</pre>
347
348<h5>normalized_mean_error</h5>
349<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>
350
351<h5>normalized_maximum_error</h5>
352<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>
353
354<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>
355
356<p>The format of the IsImagesEqual method is:</p>
357
358<pre class="code">
359 MagickBooleanType IsImagesEqual(Image *image,
360 const Image *reconstruct_image)
361</pre>
362
363<p>A description of each parameter follows.</p>
364
365<h5>image</h5>
366<p>the image.</p>
367
368<h5>reconstruct_image</h5>
369<p>the reconstruct image.</p>
370
371 </div>
372<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="SimilarityImage">SimilarityImage</a></h2>
373<div class="doc-section">
374
375<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>
376
377<p>The format of the SimilarityImageImage method is:</p>
378
379<pre class="code">
380 Image *SimilarityImage(const Image *image,const Image *reference,
381 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
382</pre>
383
384<p>A description of each parameter follows:</p>
385
386<h5>image</h5>
387<p>the image.</p>
388
389<h5>reference</h5>
390<p>find an area of the image that closely resembles this image.</p>
391
392<p>o the best match offset of the reference image within the image.</p>
393
394<h5>similarity</h5>
395<p>the computed similarity between the images.</p>
396
397<h5>exception</h5>
398<p>return any errors or warnings in this structure.</p>
399
400 </div>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame^]401
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