dual_rankdual_rankDualRankDualRankdual_rank (算子)

名称

dual_rankdual_rankDualRankDualRankdual_rank — 使用圆形或矩形掩模开、中值和闭。

签名

描述

算子 dual_rankdual_rankDualRankDualRankDualRankdual_rank carries out a non-linear transformation of the gray values of all input images (ImageImageImageImageimageimage). Circles or squares can be used as structuring elements. The operator dual_rankdual_rankDualRankDualRankDualRankdual_rank effects two consecutive calls of rank_imagerank_imageRankImageRankImageRankImagerank_image。At the first call the range gray value is calculated with the indicated range (ModePercentModePercentModePercentModePercentmodePercentmode_percent). The result of this calculation is the input of a further call of rank_imagerank_imageRankImageRankImageRankImagerank_image, this time using the range value 100-ModePercentModePercentModePercentModePercentmodePercentmode_percent。

When filtering different parameters for border treatment (MarginMarginMarginMarginmarginmargin) can be chosen: 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. A range filtering is calculated according to the following scheme: The indicated mask 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 corresponding to their gray values. Each sorted sequence of gray values contains the same number of gray values like the mask has image points. The n-th highest element, (= ModePercentModePercentModePercentModePercentmodePercentmode_percent, rank values between 0...100 in percent) is selected and set as result gray value in the corresponding result image.

If ModePercentModePercentModePercentModePercentmodePercentmode_percent is 0, then the operator equals to the gray value opening (gray_openinggray_openingGrayOpeningGrayOpeningGrayOpeninggray_opening). If ModePercentModePercentModePercentModePercentmodePercentmode_percent is 50, the operator results in the median filter, which is applied twice (median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image). The ModePercentModePercentModePercentModePercentmodePercentmode_percent 100 in dual_rankdual_rankDualRankDualRankDualRankdual_rank means that it calculates the gray value closing (gray_closinggray_closingGrayClosingGrayClosingGrayClosinggray_closing). Choosing parameter values inside this range results in a smooth transformation of these operators.

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')
dual_rank(Image,ImageOpening,'circle',10,10,'mirrored')
dev_display(ImageOpening)

read_image(&Image,"fabrik");
dual_rank(Image,&ImageOpening,"circle",10,10,"mirrored");
disp_image(ImageOpening,WindowHandle);

read_image(Image,'fabrik')
dual_rank(Image,ImageOpening,'circle',10,10,'mirrored')
dev_display(ImageOpening)

read_image(Image,'fabrik')
dual_rank(Image,ImageOpening,'circle',10,10,'mirrored')
dev_display(ImageOpening)

read_image(Image,'fabrik')
dual_rank(Image,ImageOpening,'circle',10,10,'mirrored')
dev_display(ImageOpening)

复杂度

For each pixel: with F = area of the structuring element.

结果

如果参数值正确，算子 dual_rankdual_rankDualRankDualRankDualRankdual_rank 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

可能的后继

thresholdthresholdThresholdThresholdThresholdthreshold, dyn_thresholddyn_thresholdDynThresholdDynThresholdDynThresholddyn_threshold, sub_imagesub_imageSubImageSubImageSubImagesub_image, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing

替代

rank_imagerank_imageRankImageRankImageRankImagerank_image, gray_closinggray_closingGrayClosingGrayClosingGrayClosinggray_closing, gray_openinggray_openingGrayOpeningGrayOpeningGrayOpeninggray_opening, 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, sigma_imagesigma_imageSigmaImageSigmaImageSigmaImagesigma_image

参考文献

W. Eckstein, O. Munkelt “Extracting Objects from Digital Terrain Model” Remote Sensing and Reconstruction for Threedimensional Objects and Scenes, SPIE Symposium on Optical Science, Engeneering, and Instrumentation, July 1995, San Diego

模块

基础