trimmed_meantrimmed_meanTrimmedMeanTrimmedMeantrimmed_mean (算子)

名称

trimmed_meantrimmed_meanTrimmedMeanTrimmedMeantrimmed_mean — 使用任意秩掩模平滑图像。

签名

描述

算子 trimmed_meantrimmed_meanTrimmedMeanTrimmedMeanTrimmedMeantrimmed_mean carries out a non-linear smoothing of the gray values of all input images (ImageImageImageImageimageimage). The filter mask (MaskMaskMaskMaskmaskmask) is passed in the form of a region. The average of NumberNumberNumberNumbernumbernumber gray values located near the median is calculated. Several border treatments can be chosen for filtering (MarginMarginMarginMarginmarginmargin): gray value Pixels outside of the image edges are assumed to be constant (with the indicated gray value). 'continued' Continuation of edge pixels. 'cyclic' Cyclic continuation of image edges. 'mirrored' Reflection of pixels at the image edges. The indicated mask (= region of the mask image) is put over the image to be filtered in such a way that the center of the mask touches all pixels once. For each of these pixels all neighboring pixels covered by the mask are sorted in an ascending sequence according to their gray values. Thus, each of these sorted gray value sequences contains exactly as many gray values as the mask has pixels. If F is the area of the mask the average of these sequences is calculated as follows: The first (F - Number)/2 gray values are ignored. Then the following NumberNumberNumberNumbernumbernumber gray values are summed up and divided by NumberNumberNumberNumbernumbernumber. Again the remaining (F - NumberNumberNumberNumbernumbernumber)/2 gray values are ignored.

有关平滑滤波器概念的说明，请参阅 滤波器 / 平滑 一章的引言。

注意

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

• 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

read_image(Image,'fabrik')
draw_region(Region,WindowHandle)
trimmed_mean(Image,Region,TrimmedMean,5,'mirrored')
dev_display(TrimmedMean)

read_image(&Image,"fabrik");
draw_region(&Region,WindowHandle);
trimmed_mean(Image,Region,&TrimmedMean,5,"mirrored");
disp_image(TrimmedMean,WindowHandle);

read_image(Image,'fabrik')
draw_region(Region,WindowHandle)
trimmed_mean(Image,Region,TrimmedMean,5,'mirrored')
dev_display(TrimmedMean)

read_image(Image,'fabrik')
draw_region(Region,WindowHandle)
trimmed_mean(Image,Region,TrimmedMean,5,'mirrored')
dev_display(TrimmedMean)

read_image(Image,'fabrik')
draw_region(Region,WindowHandle)
trimmed_mean(Image,Region,TrimmedMean,5,'mirrored')
dev_display(TrimmedMean)

结果

如果参数值正确，算子 trimmed_meantrimmed_meanTrimmedMeanTrimmedMeanTrimmedMeantrimmed_mean 返回值 2 ( H_MSG_TRUE )。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>)。如有必要，则抛出异常。

可能的前趋

read_imageread_imageReadImageReadImageReadImageread_image, draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region, gen_circlegen_circleGenCircleGenCircleGenCirclegen_circle, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1gen_rectangle1

可能的后继

thresholdthresholdThresholdThresholdThresholdthreshold, dyn_thresholddyn_thresholdDynThresholdDynThresholdDynThresholddyn_threshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing

替代

sigma_imagesigma_imageSigmaImageSigmaImageSigmaImagesigma_image, median_weightedmedian_weightedMedianWeightedMedianWeightedMedianWeightedmedian_weighted, median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image

另见

gen_circlegen_circleGenCircleGenCircleGenCirclegen_circle, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1gen_rectangle1, gray_erosion_rectgray_erosion_rectGrayErosionRectGrayErosionRectGrayErosionRectgray_erosion_rect, gray_dilation_rectgray_dilation_rectGrayDilationRectGrayDilationRectGrayDilationRectgray_dilation_rect

参考文献

R. Haralick, L. Shapiro; “Computer and Robot Vision”; Addison-Wesley, 1992, Seite 320

模块

基础