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212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module compare Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]215<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]216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<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]218<div class="doc-section">
219
220<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
221
222<p>The format of the CompareImageChannels method is:</p>
223
224<pre class="code">
225 Image *CompareImageChannels(const Image *image,
226 const Image *reconstruct_image,const ChannelType channel,
227 const MetricType metric,double *distortion,ExceptionInfo *exception)
228</pre>
229
230<p>A description of each parameter follows:</p>
231
232<h5>image</h5>
233<p>the image.</p>
234
235<h5>reconstruct_image</h5>
236<p>the reconstruct image.</p>
237
238<h5>channel</h5>
239<p>the channel.</p>
240
241<h5>metric</h5>
242<p>the metric.</p>
243
244<h5>distortion</h5>
245<p>the computed distortion between the images.</p>
246
247<h5>exception</h5>
248<p>return any errors or warnings in this structure.</p>
249
250 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]251<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]252<div class="doc-section">
253
254<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
255
256<p>The format of the CompareImageChannels method is:</p>
257
258<pre class="code">
259 MagickBooleanType GetImageChannelDistortion(const Image *image,
260 const Image *reconstruct_image,const ChannelType channel,
261 const MetricType metric,double *distortion,ExceptionInfo *exception)
262</pre>
263
264<p>A description of each parameter follows:</p>
265
266<h5>image</h5>
267<p>the image.</p>
268
269<h5>reconstruct_image</h5>
270<p>the reconstruct image.</p>
271
272<h5>channel</h5>
273<p>the channel.</p>
274
275<h5>metric</h5>
276<p>the metric.</p>
277
278<h5>distortion</h5>
279<p>the computed distortion between the images.</p>
280
281<h5>exception</h5>
282<p>return any errors or warnings in this structure.</p>
283
284 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]285<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]286<div class="doc-section">
287
288<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
289
290<p>The format of the CompareImageChannels method is:</p>
291
292<pre class="code">
293 double *GetImageChannelDistortions(const Image *image,
294 const Image *reconstruct_image,const MetricType metric,
295 ExceptionInfo *exception)
296</pre>
297
298<p>A description of each parameter follows:</p>
299
300<h5>image</h5>
301<p>the image.</p>
302
303<h5>reconstruct_image</h5>
304<p>the reconstruct image.</p>
305
306<h5>metric</h5>
307<p>the metric.</p>
308
309<h5>exception</h5>
310<p>return any errors or warnings in this structure.</p>
311
312 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]313<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]314<div class="doc-section">
315
316<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>
317
318<pre class="text">
319 o mean_error_per_pixel: The mean error for any single pixel in
320 the image.
321</pre>
322
323<h5>normalized_mean_error</h5>
324<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>
325
326<h5>normalized_maximum_error</h5>
327<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>
328
329<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>
330
331<p>The format of the IsImagesEqual method is:</p>
332
333<pre class="code">
334 MagickBooleanType IsImagesEqual(Image *image,
335 const Image *reconstruct_image)
336</pre>
337
338<p>A description of each parameter follows.</p>
339
340<h5>image</h5>
341<p>the image.</p>
342
343<h5>reconstruct_image</h5>
344<p>the reconstruct image.</p>
345
346 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]347<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]348<div class="doc-section">
349
350<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>
351
352<p>The format of the SimilarityImageImage method is:</p>
353
354<pre class="code">
355 Image *SimilarityImage(const Image *image,const Image *reference,
356 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
357</pre>
358
359<p>A description of each parameter follows:</p>
360
361<h5>image</h5>
362<p>the image.</p>
363
364<h5>reference</h5>
365<p>find an area of the image that closely resembles this image.</p>
366
367<p>o the best match offset of the reference image within the image.</p>
368
369<h5>similarity</h5>
370<p>the computed similarity between the images.</p>
371
372<h5>exception</h5>
373<p>return any errors or warnings in this structure.</p>
374
375 </div>
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