gray_histo_absT_gray_histo_absGrayHistoAbsGrayHistoAbsgray_histo_abs (算子)

名称

gray_histo_absT_gray_histo_absGrayHistoAbsGrayHistoAbsgray_histo_abs — 计算灰度值分布。

签名

描述

算子 gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs calculates for the image (ImageImageImageImageimageimage) within RegionsRegionsRegionsRegionsregionsregions the absolute (AbsoluteHistoAbsoluteHistoAbsoluteHistoAbsoluteHistoabsoluteHistoabsolute_histo) ) histogram of the gray values.

The parameter QuantizationQuantizationQuantizationQuantizationquantizationquantization defines, how many frequencies of neighbored gray values are added for one frequency value. The resulting histogram AbsoluteHistoAbsoluteHistoAbsoluteHistoAbsoluteHistoabsoluteHistoabsolute_histo is a tuple, whose indices are mapped on the gray values of the input image ImageImageImageImageimageimage and whose elements contain the frequencies of the gray values. The indices i of the frequency value are calculated from the gray values g and the quantization q as follows:

• For unsigned image types:

• For signed image types:

whereas MIN denotes the minimal gray value, e.g., -128 for an int1 image type. Therefore, the size of the tuple results from the ratio of the full domain of gray values and the quantization, e.g., for images of int2 in . The origin gray value of the signed image types int1 resp. int2 is mapped on the index 128 resp. 32768, negative resp. positive gray values have smaller resp. greater indices.

注意

Note that the operator gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs 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）。
• 在内部数据级别上自动并行化。

参数

结果

算子 gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs 返回值 2 ( H_MSG_TRUE) if the image has defined gray values 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。

可能的后继

histo_to_threshhisto_to_threshHistoToThreshHistoToThreshHistoToThreshhisto_to_thresh, gen_region_histogen_region_histoGenRegionHistoGenRegionHistoGenRegionHistogen_region_histo

替代

min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray, intensityintensityIntensityIntensityIntensityintensity, gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo, gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range

另见

disp_imagedisp_imageDispImageDispImageDispImagedisp_image, histo_2dimhisto_2dimHisto2dimHisto2dimHisto2dimhisto_2dim, scale_image_maxscale_image_maxScaleImageMaxScaleImageMaxScaleImageMaxscale_image_max, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray

模块

基础