robinson_dirrobinson_dirRobinsonDirRobinsonDirrobinson_dir（算子）

名称

robinson_dirrobinson_dirRobinsonDirRobinsonDirrobinson_dir — 使用罗宾逊（Robinson）算子检测边缘（振幅和方向）。

签名

robinson_dir(Image : ImageEdgeAmp, ImageEdgeDir : : )

描述

robinson_dirrobinson_dirRobinsonDirRobinsonDirRobinsonDirrobinson_dir calculates an approximation of the first derivative of the image data and is used as an edge detector. In robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmprobinson_amp the following four of the originally proposed eight 3x3 filter masks are convolved with the image. The other four masks are obtained by a multiplication by -1. All masks contain only the values 0,1,-1,2,-2. -1 0 1 2 1 0 -2 0 2 1 0 -1 -1 0 1 0 -1 -2 0 1 2 1 2 1 -1 0 1 0 0 0 -2 -1 0 -1 -2 -1 The result image contains the maximum response of all masks. The edge directions are returned in ImageEdgeDirImageEdgeDirImageEdgeDirImageEdgeDirimageEdgeDirimage_edge_dir, and are stored as x / 2. They correspond to the direction of the mask yielding the maximum response.

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

ImageImageImageImageimageimage (输入对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

输入图像。

ImageEdgeAmpImageEdgeAmpImageEdgeAmpImageEdgeAmpimageEdgeAmpimage_edge_amp (输出对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

Edge amplitude (gradient magnitude) image.

ImageEdgeDirImageEdgeDirImageEdgeDirImageEdgeDirimageEdgeDirimage_edge_dir (输出对象) (multichannel-)image(-array) → object (direction)

Edge direction image.

示例（HDevelop）

read_image(Image,'fabrik')
robinson_dir(Image,Robinson_dirA,Robinson_dirD)
threshold(Robinson_dirA,Res,128,255)

示例（C）

read_image(&Image,"fabrik");
robinson_dir(Image,&Robinson_dirA,&Robinson_dirD);
threshold(Robinson_dirA,&Res,128,255);

示例（HDevelop）

read_image(Image,'fabrik')
robinson_dir(Image,Robinson_dirA,Robinson_dirD)
threshold(Robinson_dirA,Res,128,255)

示例（HDevelop）

read_image(Image,'fabrik')
robinson_dir(Image,Robinson_dirA,Robinson_dirD)
threshold(Robinson_dirA,Res,128,255)

示例（HDevelop）

read_image(Image,'fabrik')
robinson_dir(Image,Robinson_dirA,Robinson_dirD)
threshold(Robinson_dirA,Res,128,255)

结果

robinson_dirrobinson_dirRobinsonDirRobinsonDirRobinsonDirrobinson_dir 始终返回 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。

可能的前趋

binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilterbinomial_filter, gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter, sigma_imagesigma_imageSigmaImageSigmaImageSigmaImagesigma_image, median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImagesmooth_image

可能的后继

hysteresis_thresholdhysteresis_thresholdHysteresisThresholdHysteresisThresholdHysteresisThresholdhysteresis_threshold, thresholdthresholdThresholdThresholdThresholdthreshold, gray_skeletongray_skeletonGraySkeletonGraySkeletonGraySkeletongray_skeleton, nonmax_suppression_dirnonmax_suppression_dirNonmaxSuppressionDirNonmaxSuppressionDirNonmaxSuppressionDirnonmax_suppression_dir, close_edgesclose_edgesCloseEdgesCloseEdgesCloseEdgesclose_edges, close_edges_lengthclose_edges_lengthCloseEdgesLengthCloseEdgesLengthCloseEdgesLengthclose_edges_length

替代

edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image, sobel_dirsobel_dirSobelDirSobelDirSobelDirsobel_dir, kirsch_dirkirsch_dirKirschDirKirschDirKirschDirkirsch_dir, prewitt_dirprewitt_dirPrewittDirPrewittDirPrewittDirprewitt_dir, frei_dirfrei_dirFreiDirFreiDirFreiDirfrei_dir

另见

bandpass_imagebandpass_imageBandpassImageBandpassImageBandpassImagebandpass_image, laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGausslaplace_of_gauss

模块

基础

算子