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195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h1>Module compare Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<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]198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<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]200<div class="doc-section">
201
202<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
203
204<p>The format of the CompareImageChannels method is:</p>
205
206<pre class="code">
207 Image *CompareImageChannels(const Image *image,
208 const Image *reconstruct_image,const ChannelType channel,
209 const MetricType metric,double *distortion,ExceptionInfo *exception)
210</pre>
211
212<p>A description of each parameter follows:</p>
213
214<h5>image</h5>
215<p>the image.</p>
216
217<h5>reconstruct_image</h5>
218<p>the reconstruct image.</p>
219
220<h5>channel</h5>
221<p>the channel.</p>
222
223<h5>metric</h5>
224<p>the metric.</p>
225
226<h5>distortion</h5>
227<p>the computed distortion between the images.</p>
228
229<h5>exception</h5>
230<p>return any errors or warnings in this structure.</p>
231
232 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]233<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]234<div class="doc-section">
235
236<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
237
238<p>The format of the CompareImageChannels method is:</p>
239
240<pre class="code">
241 MagickBooleanType GetImageChannelDistortion(const Image *image,
242 const Image *reconstruct_image,const ChannelType channel,
243 const MetricType metric,double *distortion,ExceptionInfo *exception)
244</pre>
245
246<p>A description of each parameter follows:</p>
247
248<h5>image</h5>
249<p>the image.</p>
250
251<h5>reconstruct_image</h5>
252<p>the reconstruct image.</p>
253
254<h5>channel</h5>
255<p>the channel.</p>
256
257<h5>metric</h5>
258<p>the metric.</p>
259
260<h5>distortion</h5>
261<p>the computed distortion between the images.</p>
262
263<h5>exception</h5>
264<p>return any errors or warnings in this structure.</p>
265
266 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]267<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]268<div class="doc-section">
269
270<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
271
272<p>The format of the CompareImageChannels method is:</p>
273
274<pre class="code">
275 double *GetImageChannelDistortions(const Image *image,
276 const Image *reconstruct_image,const MetricType metric,
277 ExceptionInfo *exception)
278</pre>
279
280<p>A description of each parameter follows:</p>
281
282<h5>image</h5>
283<p>the image.</p>
284
285<h5>reconstruct_image</h5>
286<p>the reconstruct image.</p>
287
288<h5>metric</h5>
289<p>the metric.</p>
290
291<h5>exception</h5>
292<p>return any errors or warnings in this structure.</p>
293
294 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]295<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]296<div class="doc-section">
297
298<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>
299
300<pre class="text">
301 o mean_error_per_pixel: The mean error for any single pixel in
302 the image.
303</pre>
304
305<h5>normalized_mean_error</h5>
306<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>
307
308<h5>normalized_maximum_error</h5>
309<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>
310
311<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>
312
313<p>The format of the IsImagesEqual method is:</p>
314
315<pre class="code">
316 MagickBooleanType IsImagesEqual(Image *image,
317 const Image *reconstruct_image)
318</pre>
319
320<p>A description of each parameter follows.</p>
321
322<h5>image</h5>
323<p>the image.</p>
324
325<h5>reconstruct_image</h5>
326<p>the reconstruct image.</p>
327
328 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]329<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]330<div class="doc-section">
331
332<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>
333
334<p>The format of the SimilarityImageImage method is:</p>
335
336<pre class="code">
337 Image *SimilarityImage(const Image *image,const Image *reference,
338 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
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>reference</h5>
347<p>find an area of the image that closely resembles this image.</p>
348
349<p>o the best match offset of the reference image within the image.</p>
350
351<h5>similarity</h5>
352<p>the computed similarity between the images.</p>
353
354<h5>exception</h5>
355<p>return any errors or warnings in this structure.</p>
356
357 </div>
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