intensityintensityIntensityIntensityintensity (算子)

名称

intensityintensityIntensityIntensityintensity — 计算灰度值的均值和偏差。

签名

intensity(Regions, Image : : : Mean, Deviation)

描述

The operator intensityintensityIntensityIntensityIntensityintensity calculates the mean and the deviation of the gray values in the input image within RegionsRegionsRegionsRegionsregionsregions. If R is a region, p a pixel from R with the gray value g(p) and F the plane (F = |R|), the features are defined by:

注意

Note that the operator intensityintensityIntensityIntensityIntensityintensity only considers the given RegionsRegionsRegionsRegionsregionsregions and ignores any previously set domain of the input image ImageImageImageImageimageimage. The calculation of DeviationDeviationDeviationDeviationdeviationdeviation does not follow the usual definition if the region of the image contains only one pixel. In this case 0.0 is returned.

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 (input_object) region(-array) → object

Regions in which the features are calculated.

ImageImageImageImageimageimage (input_object) singlechannelimage → object (byte / direction / cyclic / int1 / int2 / uint2 / int4 / real)

Gray value image.

MeanMeanMeanMeanmeanmean (output_control) real(-array) → (real)

Mean gray value of a region.

DeviationDeviationDeviationDeviationdeviationdeviation (output_control) real(-array) → (real)

Deviation of gray values within a region.

复杂性

若 F 为区域面积，则运行时间复杂度为 O(F)。

结果

The operator intensityintensityIntensityIntensityIntensityintensity returns the value 2 ( H_MSG_TRUE) . The behavior in case of empty input (no input images available) is set via the operator 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>). If necessary an exception is raised.

可能的后继

thresholdthresholdThresholdThresholdThresholdthreshold

替代

select_grayselect_graySelectGraySelectGraySelectGrayselect_gray, min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray

另见

mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo, gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs

模块

Foundation