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212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module compare Methods</h1>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]215<p class="navigation-index">[<a href="#CompareImages">CompareImages</a> &bull; <a href="#GetImageDistortion">GetImageDistortion</a> &bull; <a href="#GetImageDistrortion">GetImageDistrortion</a> &bull; <a href="#IsImagesEqual">IsImagesEqual</a> &bull; <a href="#SimilarityImage">SimilarityImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]217<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="CompareImages">CompareImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]218<div class="doc-section">
219
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]220<p>CompareImages() compares one or more pixel channels of an image to a reconstructed image and returns the difference image.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]221
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]222<p>The format of the CompareImages method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]223
224<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]225 Image *CompareImages(const Image *image,const Image *reconstruct_image,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]226 const MetricType metric,double *distortion,ExceptionInfo *exception)
227</pre>
228
229<p>A description of each parameter follows:</p>
230
231<h5>image</h5>
232<p>the image.</p>
233
234<h5>reconstruct_image</h5>
235<p>the reconstruct image.</p>
236
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]237<h5>metric</h5>
238<p>the metric.</p>
239
240<h5>distortion</h5>
241<p>the computed distortion between the images.</p>
242
243<h5>exception</h5>
244<p>return any errors or warnings in this structure.</p>
245
246 </div>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]247<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageDistortion">GetImageDistortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]248<div class="doc-section">
249
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]250<p>GetImageDistortion() compares one or more pixel channels of an image to a reconstructed image and returns the specified distortion metric.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]251
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]252<p>The format of the CompareImages method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]253
254<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]255 MagickBooleanType GetImageDistortion(const Image *image,
256 const Image *reconstruct_image,const MetricType metric,
257 double *distortion,ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]258</pre>
259
260<p>A description of each parameter follows:</p>
261
262<h5>image</h5>
263<p>the image.</p>
264
265<h5>reconstruct_image</h5>
266<p>the reconstruct image.</p>
267
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]268<h5>metric</h5>
269<p>the metric.</p>
270
271<h5>distortion</h5>
272<p>the computed distortion between the images.</p>
273
274<h5>exception</h5>
275<p>return any errors or warnings in this structure.</p>
276
277 </div>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]278<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageDistrortion">GetImageDistrortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]279<div class="doc-section">
280
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]281<p>GetImageDistrortion() compares the pixel channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]282
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]283<p>The format of the CompareImages method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]284
285<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]286 double *GetImageDistortions(const Image *image,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]287 const Image *reconstruct_image,const MetricType metric,
288 ExceptionInfo *exception)
289</pre>
290
291<p>A description of each parameter follows:</p>
292
293<h5>image</h5>
294<p>the image.</p>
295
296<h5>reconstruct_image</h5>
297<p>the reconstruct image.</p>
298
299<h5>metric</h5>
300<p>the metric.</p>
301
302<h5>exception</h5>
303<p>return any errors or warnings in this structure.</p>
304
305 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]306<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]307<div class="doc-section">
308
309<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>
310
311<pre class="text">
312 o mean_error_per_pixel: The mean error for any single pixel in
313 the image.
314</pre>
315
316<h5>normalized_mean_error</h5>
317<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>
318
319<h5>normalized_maximum_error</h5>
320<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>
321
322<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>
323
324<p>The format of the IsImagesEqual method is:</p>
325
326<pre class="code">
327 MagickBooleanType IsImagesEqual(Image *image,
328 const Image *reconstruct_image)
329</pre>
330
331<p>A description of each parameter follows.</p>
332
333<h5>image</h5>
334<p>the image.</p>
335
336<h5>reconstruct_image</h5>
337<p>the reconstruct image.</p>
338
339 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]340<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]341<div class="doc-section">
342
343<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>
344
345<p>The format of the SimilarityImageImage method is:</p>
346
347<pre class="code">
348 Image *SimilarityImage(const Image *image,const Image *reference,
349 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
350</pre>
351
352<p>A description of each parameter follows:</p>
353
354<h5>image</h5>
355<p>the image.</p>
356
357<h5>reference</h5>
358<p>find an area of the image that closely resembles this image.</p>
359
360<p>o the best match offset of the reference image within the image.</p>
361
362<h5>similarity</h5>
363<p>the computed similarity between the images.</p>
364
365<h5>exception</h5>
366<p>return any errors or warnings in this structure.</p>
367
368 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]369
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