1 2 3 4 5 <!DOCTYPE html> 6 <html lang="en"> 7 <head> 8 <title>ImageMagick: MagickCore, C API for ImageMagick: Image Statistics</title> 9 <meta charset="utf-8" /> 10 <meta http-equiv="X-UA-Compatible" content="IE=edge" /> 11 <meta name="viewport" content="width=device-width, initial-scale=1" /> 12 <meta http-equiv="content-type" content="text/html; charset=utf-8"/> 13 <meta name="application-name" content="ImageMagick"/> 14 <meta name="description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. 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Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p> 64 65 <p>The format of the EvaluateImage method is:</p> 66 67 <pre class="text"> 68 MagickBooleanType EvaluateImage(Image *image, 69 const MagickEvaluateOperator op,const double value, 70 ExceptionInfo *exception) 71 MagickBooleanType EvaluateImages(Image *images, 72 const MagickEvaluateOperator op,const double value, 73 ExceptionInfo *exception) 74 </pre> 75 76 <p>A description of each parameter follows:</p> 77 78 <dd> 79 </dd> 80 81 <dd> </dd> 82 <dl class="dl-horizontal"> 83 <dt>image</dt> 84 <dd>the image. </dd> 85 86 <dd> </dd> 87 <dt>op</dt> 88 <dd>A channel op. </dd> 89 90 <dd> </dd> 91 <dt>value</dt> 92 <dd>A value value. </dd> 93 94 <dd> </dd> 95 <dt>exception</dt> 96 <dd>return any errors or warnings in this structure. </dd> 97 98 <dd> </dd> 99 </dl> 100 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="FunctionImage">FunctionImage</a></h2> 101 102 <p>FunctionImage() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p> 103 104 <p>The format of the FunctionImage method is:</p> 105 106 <pre class="text"> 107 MagickBooleanType FunctionImage(Image *image, 108 const MagickFunction function,const ssize_t number_parameters, 109 const double *parameters,ExceptionInfo *exception) 110 </pre> 111 112 <p>A description of each parameter follows:</p> 113 114 <dd> 115 </dd> 116 117 <dd> </dd> 118 <dl class="dl-horizontal"> 119 <dt>image</dt> 120 <dd>the image. </dd> 121 122 <dd> </dd> 123 <dt>function</dt> 124 <dd>A channel function. </dd> 125 126 <dd> </dd> 127 <dt>parameters</dt> 128 <dd>one or more parameters. </dd> 129 130 <dd> </dd> 131 <dt>exception</dt> 132 <dd>return any errors or warnings in this structure. </dd> 133 134 <dd> </dd> 135 </dl> 136 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageEntropy">GetImageEntropy</a></h2> 137 138 <p>GetImageEntropy() returns the entropy of one or more image channels.</p> 139 140 <p>The format of the GetImageEntropy method is:</p> 141 142 <pre class="text"> 143 MagickBooleanType GetImageEntropy(const Image *image,double *entropy, 144 ExceptionInfo *exception) 145 </pre> 146 147 <p>A description of each parameter follows:</p> 148 149 <dd> 150 </dd> 151 152 <dd> </dd> 153 <dl class="dl-horizontal"> 154 <dt>image</dt> 155 <dd>the image. </dd> 156 157 <dd> </dd> 158 <dt>entropy</dt> 159 <dd>the average entropy of the selected channels. </dd> 160 161 <dd> </dd> 162 <dt>exception</dt> 163 <dd>return any errors or warnings in this structure. </dd> 164 165 <dd> </dd> 166 </dl> 167 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageExtrema">GetImageExtrema</a></h2> 168 169 <p>GetImageExtrema() returns the extrema of one or more image channels.</p> 170 171 <p>The format of the GetImageExtrema method is:</p> 172 173 <pre class="text"> 174 MagickBooleanType GetImageExtrema(const Image *image,size_t *minima, 175 size_t *maxima,ExceptionInfo *exception) 176 </pre> 177 178 <p>A description of each parameter follows:</p> 179 180 <dd> 181 </dd> 182 183 <dd> </dd> 184 <dl class="dl-horizontal"> 185 <dt>image</dt> 186 <dd>the image. </dd> 187 188 <dd> </dd> 189 <dt>minima</dt> 190 <dd>the minimum value in the channel. </dd> 191 192 <dd> </dd> 193 <dt>maxima</dt> 194 <dd>the maximum value in the channel. </dd> 195 196 <dd> </dd> 197 <dt>exception</dt> 198 <dd>return any errors or warnings in this structure. </dd> 199 200 <dd> </dd> 201 </dl> 202 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageKurtosis">GetImageKurtosis</a></h2> 203 204 <p>GetImageKurtosis() returns the kurtosis and skewness of one or more image channels.</p> 205 206 <p>The format of the GetImageKurtosis method is:</p> 207 208 <pre class="text"> 209 MagickBooleanType GetImageKurtosis(const Image *image,double *kurtosis, 210 double *skewness,ExceptionInfo *exception) 211 </pre> 212 213 <p>A description of each parameter follows:</p> 214 215 <dd> 216 </dd> 217 218 <dd> </dd> 219 <dl class="dl-horizontal"> 220 <dt>image</dt> 221 <dd>the image. </dd> 222 223 <dd> </dd> 224 <dt>kurtosis</dt> 225 <dd>the kurtosis of the channel. </dd> 226 227 <dd> </dd> 228 <dt>skewness</dt> 229 <dd>the skewness of the channel. </dd> 230 231 <dd> </dd> 232 <dt>exception</dt> 233 <dd>return any errors or warnings in this structure. </dd> 234 235 <dd> </dd> 236 </dl> 237 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageMean">GetImageMean</a></h2> 238 239 <p>GetImageMean() returns the mean and standard deviation of one or more image channels.</p> 240 241 <p>The format of the GetImageMean method is:</p> 242 243 <pre class="text"> 244 MagickBooleanType GetImageMean(const Image *image,double *mean, 245 double *standard_deviation,ExceptionInfo *exception) 246 </pre> 247 248 <p>A description of each parameter follows:</p> 249 250 <dd> 251 </dd> 252 253 <dd> </dd> 254 <dl class="dl-horizontal"> 255 <dt>image</dt> 256 <dd>the image. </dd> 257 258 <dd> </dd> 259 <dt>mean</dt> 260 <dd>the average value in the channel. </dd> 261 262 <dd> </dd> 263 <dt>standard_deviation</dt> 264 <dd>the standard deviation of the channel. </dd> 265 266 <dd> </dd> 267 <dt>exception</dt> 268 <dd>return any errors or warnings in this structure. </dd> 269 270 <dd> </dd> 271 </dl> 272 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageMoments">GetImageMoments</a></h2> 273 274 <p>GetImageMoments() returns the normalized moments of one or more image channels.</p> 275 276 <p>The format of the GetImageMoments method is:</p> 277 278 <pre class="text"> 279 ChannelMoments *GetImageMoments(const Image *image, 280 ExceptionInfo *exception) 281 </pre> 282 283 <p>A description of each parameter follows:</p> 284 285 <dd> 286 </dd> 287 288 <dd> </dd> 289 <dl class="dl-horizontal"> 290 <dt>image</dt> 291 <dd>the image. </dd> 292 293 <dd> </dd> 294 <dt>exception</dt> 295 <dd>return any errors or warnings in this structure. </dd> 296 297 <dd> </dd> 298 </dl> 299 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImagePerceptualHash">GetImagePerceptualHash</a></h2> 300 301 <p>GetImagePerceptualHash() returns the perceptual hash of one or more image channels.</p> 302 303 <p>The format of the GetImagePerceptualHash method is:</p> 304 305 <pre class="text"> 306 ChannelPerceptualHash *GetImagePerceptualHash(const Image *image, 307 ExceptionInfo *exception) 308 </pre> 309 310 <p>A description of each parameter follows:</p> 311 312 <dd> 313 </dd> 314 315 <dd> </dd> 316 <dl class="dl-horizontal"> 317 <dt>image</dt> 318 <dd>the image. </dd> 319 320 <dd> </dd> 321 <dt>exception</dt> 322 <dd>return any errors or warnings in this structure. </dd> 323 324 <dd> </dd> 325 </dl> 326 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageRange">GetImageRange</a></h2> 327 328 <p>GetImageRange() returns the range of one or more image channels.</p> 329 330 <p>The format of the GetImageRange method is:</p> 331 332 <pre class="text"> 333 MagickBooleanType GetImageRange(const Image *image,double *minima, 334 double *maxima,ExceptionInfo *exception) 335 </pre> 336 337 <p>A description of each parameter follows:</p> 338 339 <dd> 340 </dd> 341 342 <dd> </dd> 343 <dl class="dl-horizontal"> 344 <dt>image</dt> 345 <dd>the image. </dd> 346 347 <dd> </dd> 348 <dt>minima</dt> 349 <dd>the minimum value in the channel. </dd> 350 351 <dd> </dd> 352 <dt>maxima</dt> 353 <dd>the maximum value in the channel. </dd> 354 355 <dd> </dd> 356 <dt>exception</dt> 357 <dd>return any errors or warnings in this structure. </dd> 358 359 <dd> </dd> 360 </dl> 361 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageStatistics">GetImageStatistics</a></h2> 362 363 <p>GetImageStatistics() returns statistics for each channel in the image. The statistics include the channel depth, its minima, maxima, mean, standard deviation, kurtosis and skewness. You can access the red channel mean, for example, like this:</p> 364 365 <pre class="text"> 366 channel_statistics=GetImageStatistics(image,exception); 367 red_mean=channel_statistics[RedPixelChannel].mean; 368 </pre> 369 370 <p>Use MagickRelinquishMemory() to free the statistics buffer.</p> 371 372 <p>The format of the GetImageStatistics method is:</p> 373 374 <pre class="text"> 375 ChannelStatistics *GetImageStatistics(const Image *image, 376 ExceptionInfo *exception) 377 </pre> 378 379 <p>A description of each parameter follows:</p> 380 381 <dd> 382 </dd> 383 384 <dd> </dd> 385 <dl class="dl-horizontal"> 386 <dt>image</dt> 387 <dd>the image. </dd> 388 389 <dd> </dd> 390 <dt>exception</dt> 391 <dd>return any errors or warnings in this structure. </dd> 392 393 <dd> </dd> 394 </dl> 395 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="PolynomialImage">PolynomialImage</a></h2> 396 397 <p>PolynomialImage() returns a new image where each pixel is the sum of the pixels in the image sequence after applying its corresponding terms (coefficient and degree pairs).</p> 398 399 <p>The format of the PolynomialImage method is:</p> 400 401 <pre class="text"> 402 Image *PolynomialImage(const Image *images,const size_t number_terms, 403 const double *terms,ExceptionInfo *exception) 404 </pre> 405 406 <p>A description of each parameter follows:</p> 407 408 <dd> 409 </dd> 410 411 <dd> </dd> 412 <dl class="dl-horizontal"> 413 <dt>images</dt> 414 <dd>the image sequence. </dd> 415 416 <dd> </dd> 417 <dt>number_terms</dt> 418 <dd>the number of terms in the list. The actual list length is 2 x number_terms + 1 (the constant). </dd> 419 420 <dd> </dd> 421 <dt>terms</dt> 422 <dd>the list of polynomial coefficients and degree pairs and a constant. </dd> 423 424 <dd> </dd> 425 <dt>exception</dt> 426 <dd>return any errors or warnings in this structure. </dd> 427 428 <dd> </dd> 429 </dl> 430 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="StatisticImage">StatisticImage</a></h2> 431 432 <p>StatisticImage() makes each pixel the min / max / median / mode / etc. of the neighborhood of the specified width and height.</p> 433 434 <p>The format of the StatisticImage method is:</p> 435 436 <pre class="text"> 437 Image *StatisticImage(const Image *image,const StatisticType type, 438 const size_t width,const size_t height,ExceptionInfo *exception) 439 </pre> 440 441 <p>A description of each parameter follows:</p> 442 443 <dd> 444 </dd> 445 446 <dd> </dd> 447 <dl class="dl-horizontal"> 448 <dt>image</dt> 449 <dd>the image. </dd> 450 451 <dd> </dd> 452 <dt>type</dt> 453 <dd>the statistic type (median, mode, etc.). </dd> 454 455 <dd> </dd> 456 <dt>width</dt> 457 <dd>the width of the pixel neighborhood. </dd> 458 459 <dd> </dd> 460 <dt>height</dt> 461 <dd>the height of the pixel neighborhood. </dd> 462 463 <dd> </dd> 464 <dt>exception</dt> 465 <dd>return any errors or warnings in this structure. </dd> 466 467 <dd> </dd> 468 </dl> 469 </div> 470 <footer class="magick-footer"> 471 <p><a href="../support.html">Donate</a> 472 <a href="../sitemap.html">Sitemap</a> 473 <a href="../links.html">Related</a> 474 <a href="../architecture.html">Architecture</a> 475 </p> 476 <p><a href="statistic.html#">Back to top</a> 477 <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> 478 <a href="http://www.imagemagick.org/script/contact.php">Contact Us</a></p> 479 <p><small> 1999-2016 ImageMagick Studio LLC</small></p> 480 </footer> 481 </div><!-- /.container --> 482 483 <script src="https://localhost/ajax/libs/jquery/1.11.3/jquery.min.js"></script> 484 <script src="../js/magick.html"></script> 485 </div> 486 </body> 487 </html> 488
