circularity_xldcircularity_xldCircularityXldCircularityXldcircularity_xld (算子名称)

名称

circularity_xldcircularity_xldCircularityXldCircularityXldcircularity_xld — Shape factor for the circularity (similarity to a circle) of contours or polygons.

参数签名

描述

该算子 circularity_xldcircularity_xldCircularityXldCircularityXldCircularityXldcircularity_xld calculates the similarity of each input contour or polygon with a circle. The input contour or polygon must not intersect itself, otherwise the resulting parameter is not meaningful (Whether the input contour or polygon intersects itself or not can be determined with test_self_intersection_xldtest_self_intersection_xldTestSelfIntersectionXldTestSelfIntersectionXldTestSelfIntersectionXldtest_self_intersection_xld). If the input contour or polygon is not closed it will be closed automatically.

Calculation: If F is the enclosed area of the contour or polygon and max is the maximum distance from the center to all contour or polygon pixels, the shape factor CircularityCircularityCircularityCircularitycircularitycircularity is defined as: The shape factor CircularityCircularityCircularityCircularitycircularitycircularity of a circle is 1. If the contour or polygon encloses an elongated area CircularityCircularityCircularityCircularitycircularitycircularity is smaller than 1. 该算子 circularity_xldcircularity_xldCircularityXldCircularityXldCircularityXldcircularity_xld especially responds to large bulges.

If more than one contour or polygon is passed, the numerical values of the shape factor are stored in a tuple in the same order as the respective contours or polygons in XLDXLDXLDXLDXLDxld.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 在元组级别自动并行化。

参数表

结果

该算子 circularity_xldcircularity_xldCircularityXldCircularityXldCircularityXldcircularity_xld 返回值 2 ( H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input contour available) is set via 该算子 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>). If necessary an exception is raised.

可能的前置算子

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld, edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPixedges_sub_pix, threshold_sub_pixthreshold_sub_pixThresholdSubPixThresholdSubPixThresholdSubPixthreshold_sub_pix, gen_contour_polygon_xldgen_contour_polygon_xldGenContourPolygonXldGenContourPolygonXldGenContourPolygonXldgen_contour_polygon_xld, test_self_intersection_xldtest_self_intersection_xldTestSelfIntersectionXldTestSelfIntersectionXldTestSelfIntersectionXldtest_self_intersection_xld

可替代算子

compactness_xldcompactness_xldCompactnessXldCompactnessXldCompactnessXldcompactness_xld, convexity_xldconvexity_xldConvexityXldConvexityXldConvexityXldconvexity_xld, eccentricity_xldeccentricity_xldEccentricityXldEccentricityXldEccentricityXldeccentricity_xld, rectangularity_xldrectangularity_xldRectangularityXldRectangularityXldRectangularityXldrectangularity_xld

参考其它

area_center_xldarea_center_xldAreaCenterXldAreaCenterXldAreaCenterXldarea_center_xld, select_shape_xldselect_shape_xldSelectShapeXldSelectShapeXldSelectShapeXldselect_shape_xld

模块

Foundation