deviation_imagedeviation_imageDeviationImageDeviationImagedeviation_image（算子）

名称

deviation_imagedeviation_imageDeviationImageDeviationImagedeviation_image — 计算矩形窗口内灰度值的标准偏差。

签名

deviation_image(Image : ImageDeviation : Width, Height : )

描述

deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImagedeviation_image calculates the standard deviation of gray values in the image ImageImageImageImageimageimage within a rectangular mask of size (HeightHeightHeightHeightheightheight, WidthWidthWidthWidthwidthwidth). The resulting image is returned in ImageDeviationImageDeviationImageDeviationImageDeviationimageDeviationimage_deviation. To better use the range of gray values available in the output image, the result is multiplied by 2. If the parameters HeightHeightHeightHeightheightheight 和 WidthWidthWidthWidthwidthwidth are even, they are changed to the next larger odd value. At the image borders the gray values are mirrored.

注意

deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImagedeviation_image 可在 OpenCL 设备上执行。 As the same OpenCL code is used, the same limitations as for mean_imagemean_imageMeanImageMeanImageMeanImagemean_image apply. Since deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImagedeviation_image uses single precision floating point arithmetic internally, the results may differ slightly from the CPU version.

请注意，若使用域缩减后的图像作为输入，滤波器算子可能会返回意外结果。请参阅滤波器一章

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）。
在元组级别上自动并行化。
在通道级别上自动并行化。
在域级别上自动并行化。

参数

ImageImageImageImageimageimage (输入对象) (multichannel-)image(-array) → object (byte* / int4* / real* / int2* / uint2*) *允许用于计算设备

Image for which the standard deviation is to be calculated.

ImageDeviationImageDeviationImageDeviationImageDeviationimageDeviationimage_deviation (输出对象) image(-array) → object (byte / int4 / real / int2 / uint2)

Image containing the standard deviation.

WidthWidthWidthWidthwidthwidth (输入控制) extent.x → (integer)

Width of the mask in which the standard deviation is calculated.

默认值： 11

建议值： 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25

限制： 3 <= Width && odd(Width) && Width < width(Image) * 2

HeightHeightHeightHeightheightheight (输入控制) extent.y → (integer)

Height of the mask in which the standard deviation is calculated.

默认值： 11

建议值： 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25

限制： 3 <= Height && odd(Height) && Height < height(Image) * 2

示例（HDevelop）

read_image(Image,'fabrik')
dev_display(Image)
deviation_image(Image,Deviation,9,9)
dev_display(Image)

示例（C）

read_image(&Image,"fabrik");
disp_image(Image,WindowHandle);
deviation_image(Image,&Deviation,9,9);
disp_image(Deviation,WindowHandle);

示例（HDevelop）

read_image(Image,'fabrik')
dev_display(Image)
deviation_image(Image,Deviation,9,9)
dev_display(Image)

示例（HDevelop）

read_image(Image,'fabrik')
dev_display(Image)
deviation_image(Image,Deviation,9,9)
dev_display(Image)

示例（HDevelop）

read_image(Image,'fabrik')
dev_display(Image)
deviation_image(Image,Deviation,9,9)
dev_display(Image)

结果

deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImagedeviation_image 在所有参数正确时返回 2 (H_MSG_TRUE)。当输入为空时，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>)。如有必要，则抛出异常。

可能的后继

disp_imagedisp_imageDispImageDispImageDispImagedisp_image

替代

entropy_imageentropy_imageEntropyImageEntropyImageEntropyImageentropy_image, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray

另见

convol_imageconvol_imageConvolImageConvolImageConvolImageconvol_image, texture_lawstexture_lawsTextureLawsTextureLawsTextureLawstexture_laws, intensityintensityIntensityIntensityIntensityintensity

模块

基础

算子