gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld (算子)

名称

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld — 将骨架转换为 XLD 轮廓。

签名

描述

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld converts the input skeleton (e.g., edges) SkeletonSkeletonSkeletonSkeletonskeletonskeleton, which is assumed to contain mostly one pixel wide regions (see skeletonskeletonSkeletonSkeletonSkeletonskeleton), into XLD contours.

The algorithm first attempts to transform the regions to contain only line segments in 8-neighborhood. In a second step, the junction points are labeled. After this, gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld tries to generate contours which end in junction or end points, in particular for junction points of the following configurations (in all four possible rotations): 1 0 1 1 0 1 1 0 0 1 0 0 0 1 0 0 1 0 0 2 0 0 2 0 0 2 1 0 2 1 0 2 1 1 2 1 0 0 1 1 0 1 0 1 0 1 0 0 0 1 0 0 1 0 where 0 = background, 1 = foreground, and 2 = junction point.

After this, all contours having at least LengthLengthLengthLengthlengthlength points are returned. Since contours are split at junction points, possibly long contours may be split into several short segments because of short adjacent lines, even if they are longer than LengthLengthLengthLengthlengthlength points, if ModeModeModeModemodemode = 'filter'"filter""filter""filter""filter""filter" was selected. This can be avoided by setting ModeModeModeModemodemode = 'generalize1'"generalize1""generalize1""generalize1""generalize1""generalize1". In this case, the contours are generated as if the segments shorter than LengthLengthLengthLengthlengthlength were not contained in the input region. In order to preserve line segments, which are split into very short segments by the crossing of short lines, ModeModeModeModemodemode = 'generalize2'"generalize2""generalize2""generalize2""generalize2""generalize2" can be selected. In this case, line segments are preserved if they end in two junction points, even if they are shorter than LengthLengthLengthLengthlengthlength。

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）。
• 未采用并行化处理。

参数

可能的前趋

skeletonskeletonSkeletonSkeletonSkeletonskeleton

可能的后继

smooth_contours_xldsmooth_contours_xldSmoothContoursXldSmoothContoursXldSmoothContoursXldsmooth_contours_xld, get_contour_xldget_contour_xldGetContourXldGetContourXldGetContourXldget_contour_xld, gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldGenPolygonsXldgen_polygons_xld

另见

edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image, thresholdthresholdThresholdThresholdThresholdthreshold, get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContourget_region_contour

模块

基础