gray_histoT_gray_histoGrayHistoGrayHistogray_histo (算子)

名称

gray_histoT_gray_histoGrayHistoGrayHistogray_histo — 计算灰度值分布。

签名

描述

算子 gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo calculates for the image (ImageImageImageImageimageimage) within RegionsRegionsRegionsRegionsregionsregions the absolute (AbsoluteHistoAbsoluteHistoAbsoluteHistoAbsoluteHistoabsoluteHistoabsolute_histo) and relative (RelativeHistoRelativeHistoRelativeHistoRelativeHistorelativeHistorelative_histo) histogram of the gray values.

Both histograms are tuples of 256 values, which --- beginning at 0 --- contain the frequencies of the individual gray values of the image.

AbsoluteHistoAbsoluteHistoAbsoluteHistoAbsoluteHistoabsoluteHistoabsolute_histo indicates the absolute frequencies of the gray values in integers, and RelativeHistoRelativeHistoRelativeHistoRelativeHistorelativeHistorelative_histo indicates the relative, i.e. the absolute frequencies divided by the area of the image as floating point numbers.

'real'"real""real""real""real""real"-, 'int2'"int2""int2""int2""int2""int2"-, 'uint2'"uint2""uint2""uint2""uint2""uint2"-, and 'int4'"int4""int4""int4""int4""int4"-images are transformed into 'byte'"byte""byte""byte""byte""byte"-images (first the largest and smallest gray value in the image are determined, and then the original gray values are mapped linearly into the area 0..255) and then processed as mentioned above.

注意

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

Real, int2, uint2, and int4 images are reduced to 256 gray values.

gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo can be executed on OpenCL devices for byte, int1, directional and cyclic images if the OpenCL device supports the cl_khr_local_int32_base_atomics and cl_khr_global_int32_base_atomics extensions (which are optional in OpenCL 1.0). Unlike most other HALCON operators, gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo can be substantially slower on an OpenCL device if the ImageImageImageImageimageimage is not completely included in the RegionsRegionsRegionsRegionsregionsregions。

OpenCL support is not available in HALCON XL, as 64 bit atomic integer arithmetic would be required.

执行信息

• 支持 OpenCL 计算设备。
• 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

复杂度

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

结果

算子 gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo 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_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs, gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range

另见

set_paintset_paintSetPaintSetPaintSetPaintset_paint, histo_2dimhisto_2dimHisto2dimHisto2dimHisto2dimhisto_2dim, scale_image_maxscale_image_maxScaleImageMaxScaleImageMaxScaleImageMaxscale_image_max, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray

模块

基础