close_edgesclose_edgesCloseEdgesCloseEdgesclose_edges (Operator)

名称

close_edgesclose_edgesCloseEdgesCloseEdgesclose_edges — 使用边缘振幅图像闭合边缘间隙。

签名

close_edges(Edges, EdgeImage : RegionResult : MinAmplitude : )

描述

close_edgesclose_edgesCloseEdgesCloseEdgesCloseEdgesclose_edges closes gaps in the output of an edge detector, and thus tries to produce complete object contours. This is done by examining the neighbors of each edge point to determine the point with maximum amplitude (i.e., maximum gradient), and adding the point to the edge if its amplitude is larger than the minimum amplitude passed in MinAmplitudeMinAmplitudeMinAmplitudeMinAmplitudeminAmplitudemin_amplitude. This operator expects as input the edges (EdgesEdgesEdgesEdgesedgesedges) and amplitude image (EdgeImageEdgeImageEdgeImageEdgeImageedgeImageedge_image) returned by typical edge operators, such as edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image or sobel_ampsobel_ampSobelAmpSobelAmpSobelAmpsobel_amp. close_edgesclose_edgesCloseEdgesCloseEdgesCloseEdgesclose_edges does not take into account the edge directions that may be returned by an edge operator. Thus, in areas where the gradient is almost constant the edges may become rather “wiggly.”

注意

Note that filter operators may return unexpected results if an image with a reduced domain is used as input. Please refer to the chapter 滤波器.

执行信息

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.

参数

EdgesEdgesEdgesEdgesedgesedges (input_object) region(-array) → object

Region containing one pixel thick edges.

EdgeImageEdgeImageEdgeImageEdgeImageedgeImageedge_image (input_object) singlechannelimage → object (byte / uint2 / int4)

Edge amplitude (gradient) image.

RegionResultRegionResultRegionResultRegionResultregionResultregion_result (output_object) region(-array) → object

Region containing closed edges.

MinAmplitudeMinAmplitudeMinAmplitudeMinAmplitudeminAmplitudemin_amplitude (input_control) integer → (integer)

Minimum edge amplitude.

默认值： 16

建议值： 5, 8, 10, 12, 16, 20, 25, 30, 40, 50

值范围： 1 ≤ MinAmplitude MinAmplitude MinAmplitude MinAmplitude minAmplitude min_amplitude

最小增量： 1

建议增量： 1

示例（C）

sobel_amp(Image,&EdgeAmp,"sum_abs",5);
threshold(EdgeAmp,&EdgeRegion,40.0,255.0);
skeleton(EdgeRegion,&ThinEdge);
close_edges(ThinEdge,EdgeAmp,&CloseEdges,15);
skeleton(CloseEdges,&ThinCloseEdges);

结果

close_edgesclose_edgesCloseEdgesCloseEdgesCloseEdgesclose_edges returns 2 ( H_MSG_TRUE) if all parameters are correct. If the input is empty the behavior can be set via 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>). If necessary, an exception is raised.

可能的前置算子

edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image, sobel_ampsobel_ampSobelAmpSobelAmpSobelAmpsobel_amp, thresholdthresholdThresholdThresholdThresholdthreshold, skeletonskeletonSkeletonSkeletonSkeletonskeleton

可能的后继算子

skeletonskeletonSkeletonSkeletonSkeletonskeleton

替代算子

close_edges_lengthclose_edges_lengthCloseEdgesLengthCloseEdgesLengthCloseEdgesLengthclose_edges_length, dilation1dilation1Dilation1Dilation1Dilation1dilation1, closingclosingClosingClosingClosingclosing

另见

gray_skeletongray_skeletonGraySkeletonGraySkeletonGraySkeletongray_skeleton

模块

Foundation

算子