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216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<h1>Module compare Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]218<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]219
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]220<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]221<div class="doc-section">
222
223<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
224
225<p>The format of the CompareImageChannels method is:</p>
226
227<pre class="code">
228 Image *CompareImageChannels(const Image *image,
229 const Image *reconstruct_image,const ChannelType channel,
230 const MetricType metric,double *distortion,ExceptionInfo *exception)
231</pre>
232
233<p>A description of each parameter follows:</p>
234
235<h5>image</h5>
236<p>the image.</p>
237
238<h5>reconstruct_image</h5>
239<p>the reconstruct image.</p>
240
241<h5>channel</h5>
242<p>the channel.</p>
243
244<h5>metric</h5>
245<p>the metric.</p>
246
247<h5>distortion</h5>
248<p>the computed distortion between the images.</p>
249
250<h5>exception</h5>
251<p>return any errors or warnings in this structure.</p>
252
253 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]254<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]255<div class="doc-section">
256
257<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
258
259<p>The format of the CompareImageChannels method is:</p>
260
261<pre class="code">
262 MagickBooleanType GetImageChannelDistortion(const Image *image,
263 const Image *reconstruct_image,const ChannelType channel,
264 const MetricType metric,double *distortion,ExceptionInfo *exception)
265</pre>
266
267<p>A description of each parameter follows:</p>
268
269<h5>image</h5>
270<p>the image.</p>
271
272<h5>reconstruct_image</h5>
273<p>the reconstruct image.</p>
274
275<h5>channel</h5>
276<p>the channel.</p>
277
278<h5>metric</h5>
279<p>the metric.</p>
280
281<h5>distortion</h5>
282<p>the computed distortion between the images.</p>
283
284<h5>exception</h5>
285<p>return any errors or warnings in this structure.</p>
286
287 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]288<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]289<div class="doc-section">
290
291<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
292
293<p>The format of the CompareImageChannels method is:</p>
294
295<pre class="code">
296 double *GetImageChannelDistortions(const Image *image,
297 const Image *reconstruct_image,const MetricType metric,
298 ExceptionInfo *exception)
299</pre>
300
301<p>A description of each parameter follows:</p>
302
303<h5>image</h5>
304<p>the image.</p>
305
306<h5>reconstruct_image</h5>
307<p>the reconstruct image.</p>
308
309<h5>metric</h5>
310<p>the metric.</p>
311
312<h5>exception</h5>
313<p>return any errors or warnings in this structure.</p>
314
315 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]316<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]317<div class="doc-section">
318
319<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>
320
321<pre class="text">
322 o mean_error_per_pixel: The mean error for any single pixel in
323 the image.
324</pre>
325
326<h5>normalized_mean_error</h5>
327<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>
328
329<h5>normalized_maximum_error</h5>
330<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>
331
332<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>
333
334<p>The format of the IsImagesEqual method is:</p>
335
336<pre class="code">
337 MagickBooleanType IsImagesEqual(Image *image,
338 const Image *reconstruct_image)
339</pre>
340
341<p>A description of each parameter follows.</p>
342
343<h5>image</h5>
344<p>the image.</p>
345
346<h5>reconstruct_image</h5>
347<p>the reconstruct image.</p>
348
349 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]350<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]351<div class="doc-section">
352
353<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>
354
355<p>The format of the SimilarityImageImage method is:</p>
356
357<pre class="code">
358 Image *SimilarityImage(const Image *image,const Image *reference,
359 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
360</pre>
361
362<p>A description of each parameter follows:</p>
363
364<h5>image</h5>
365<p>the image.</p>
366
367<h5>reference</h5>
368<p>find an area of the image that closely resembles this image.</p>
369
370<p>o the best match offset of the reference image within the image.</p>
371
372<h5>similarity</h5>
373<p>the computed similarity between the images.</p>
374
375<h5>exception</h5>
376<p>return any errors or warnings in this structure.</p>
377
378 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]379
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