entropy_grayentropy_grayEntropyGrayEntropyGrayentropy_gray (算子)

名称

entropy_grayentropy_grayEntropyGrayEntropyGrayentropy_gray — 确定图像的熵和各向异性。

签名

entropy_gray(Regions, Image : : : Entropy, Anisotropy)

描述

算子 entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray creates the histogram of relative frequencies of the gray values in the input image and calculates from these frequencies the entropy and the anisotropy coefficient for each region from RegionsRegionsRegionsRegionsregionsregions according to the following formulae:

Entropy: Anisotropiy coefficient: where rel[i] histogram of relative gray value frequencies i Gray value of input image (0..255) and k Smallest possible gray value with sum(rel[i]) >= 0.5

注意

Note that the operator entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray only considers the given RegionsRegionsRegionsRegionsregionsregions and ignores any previously set domain of the input image ImageImageImageImageimageimage。

执行信息

多线程类型：可重入（与非独占算子并行运行）。
多线程作用域：全局（可从任何线程调用）。
在元组级别上自动并行化。

参数

RegionsRegionsRegionsRegionsregionsregions (输入对象) region(-array) → object

Regions where the features are to be determined.

ImageImageImageImageimageimage (输入对象) singlechannelimage → object (byte)

灰度值图像。

EntropyEntropyEntropyEntropyentropyentropy (输出控制) real(-array) → (real)

Information content (entropy) of the gray values.

Assertion: 0 <= Entropy && Entropy <= 8

AnisotropyAnisotropyAnisotropyAnisotropyanisotropyanisotropy (输出控制) real(-array) → (real)

Measure of the symmetry of gray value distribution.

复杂度

If F is the area of the region the runtime complexity is O(F + 255).

结果

算子 entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray 返回值 2 ( H_MSG_TRUE) if an image with defined gray values is entered and the parameters are correct.当输入为空（无可用输入图像）时可设置行为通过算子 set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>), the behavior in case of empty region is set via set_system(::'empty_region_result',<Result>:)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)set_system("empty_region_result",<Result>)。如有必要，则抛出异常。

替代

select_grayselect_graySelectGraySelectGraySelectGrayselect_gray

另见

entropy_imageentropy_imageEntropyImageEntropyImageEntropyImageentropy_image, gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo, gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs, fuzzy_entropyfuzzy_entropyFuzzyEntropyFuzzyEntropyFuzzyEntropyfuzzy_entropy, fuzzy_perimeterfuzzy_perimeterFuzzyPerimeterFuzzyPerimeterFuzzyPerimeterfuzzy_perimeter

模块

基础

算子