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164
165<div class="main">
166
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]167<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>
168
169<h2><a href="http://www.imagemagick.org/api/MagickCore/compare
170_8c.html" target="source" name="CompareImageChannels">CompareImageChannels</a></h2>
171<div class="doc-section">
172
173<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p></ol>
174
175<p>The format of the CompareImageChannels method is:</p>
176
177<pre class="code">
178 Image *CompareImageChannels(const Image *image,
179 const Image *reconstruct_image,const ChannelType channel,
180 const MetricType metric,double *distortion,ExceptionInfo *exception)
181</pre>
182
183<p>A description of each parameter follows:</p></ol>
184
185<h5>image</h5>
186<ol><p>the image.</p></ol>
187
188<h5>reconstruct_image</h5>
189<ol><p>the reconstruct image.</p></ol>
190
191<h5>channel</h5>
192<ol><p>the channel.</p></ol>
193
194<h5>metric</h5>
195<ol><p>the metric.</p></ol>
196
197<h5>distortion</h5>
198<ol><p>the computed distortion between the images.</p></ol>
199
200<h5>exception</h5>
201<ol><p>return any errors or warnings in this structure.</p></ol>
202
203 </div>
204<h2><a href="http://www.imagemagick.org/api/MagickCore/compare
205_8c.html" target="source" name="GetImageChannelDistortion">GetImageChannelDistortion</a></h2>
206<div class="doc-section">
207
208<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p></ol>
209
210<p>The format of the CompareImageChannels method is:</p>
211
212<pre class="code">
213 MagickBooleanType GetImageChannelDistortion(const Image *image,
214 const Image *reconstruct_image,const ChannelType channel,
215 const MetricType metric,double *distortion,ExceptionInfo *exception)
216</pre>
217
218<p>A description of each parameter follows:</p></ol>
219
220<h5>image</h5>
221<ol><p>the image.</p></ol>
222
223<h5>reconstruct_image</h5>
224<ol><p>the reconstruct image.</p></ol>
225
226<h5>channel</h5>
227<ol><p>the channel.</p></ol>
228
229<h5>metric</h5>
230<ol><p>the metric.</p></ol>
231
232<h5>distortion</h5>
233<ol><p>the computed distortion between the images.</p></ol>
234
235<h5>exception</h5>
236<ol><p>return any errors or warnings in this structure.</p></ol>
237
238 </div>
239<h2><a href="http://www.imagemagick.org/api/MagickCore/compare
240_8c.html" target="source" name="GetImageChannelDistrortion">GetImageChannelDistrortion</a></h2>
241<div class="doc-section">
242
243<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p></ol>
244
245<p>The format of the CompareImageChannels method is:</p>
246
247<pre class="code">
248 double *GetImageChannelDistortions(const Image *image,
249 const Image *reconstruct_image,const MetricType metric,
250 ExceptionInfo *exception)
251</pre>
252
253<p>A description of each parameter follows:</p></ol>
254
255<h5>image</h5>
256<ol><p>the image.</p></ol>
257
258<h5>reconstruct_image</h5>
259<ol><p>the reconstruct image.</p></ol>
260
261<h5>metric</h5>
262<ol><p>the metric.</p></ol>
263
264<h5>exception</h5>
265<ol><p>return any errors or warnings in this structure.</p></ol>
266
267 </div>
268<h2><a href="http://www.imagemagick.org/api/MagickCore/compare
269_8c.html" target="source" name="IsImagesEqual">IsImagesEqual</a></h2>
270<div class="doc-section">
271
272<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>
273
274<pre class="text">
275 o mean_error_per_pixel: The mean error for any single pixel in
276 the image.
277</pre>
278
279<h5>normalized_mean_error</h5>
280<ol><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></ol>
281
282<h5>normalized_maximum_error</h5>
283<ol><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></ol>
284
285<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></ol>
286
287<p>The format of the IsImagesEqual method is:</p>
288
289<pre class="code">
290 MagickBooleanType IsImagesEqual(Image *image,
291 const Image *reconstruct_image)
292</pre>
293
294<p>A description of each parameter follows.</p></ol>
295
296<h5>image</h5>
297<ol><p>the image.</p></ol>
298
299<h5>reconstruct_image</h5>
300<ol><p>the reconstruct image.</p></ol>
301
302 </div>
303<h2><a href="http://www.imagemagick.org/api/MagickCore/compare
304_8c.html" target="source" name="SimilarityImage">SimilarityImage</a></h2>
305<div class="doc-section">
306
307<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></ol>
308
309<p>The format of the SimilarityImageImage method is:</p>
310
311<pre class="code">
312 Image *SimilarityImage(const Image *image,const Image *reference,
313 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
314</pre>
315
316<p>A description of each parameter follows:</p></ol>
317
318<h5>image</h5>
319<ol><p>the image.</p></ol>
320
321<h5>reference</h5>
322<ol><p>find an area of the image that closely resembles this image.</p></ol>
323
324<p>o the best match offset of the reference image within the image.</p></ol>
325
326<h5>similarity</h5>
327<ol><p>the computed similarity between the images.</p></ol>
328
329<h5>exception</h5>
330<ol><p>return any errors or warnings in this structure.</p></ol>
331
332 </div>
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]360</body>
361</html>