gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXld (Operator)

Name

gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXld — Compute the parallel contour of an XLD contour.

Signature

gen_parallel_contour_xld(Contours : ParallelContours : Mode, Distance : )

Description

gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXldGenParallelContourXld computes for each of the input contours ContoursContoursContoursContourscontours a parallel contour with distance DistanceDistanceDistanceDistancedistance. The resulting contours are returned in ParallelContoursParallelContoursParallelContoursParallelContoursparallelContours. To calculate the parallel contour, the normal vector of the input contour is needed in every contour point. The parameter ModeModeModeModemode determines how these normal vectors are computed. If ModeModeModeModemode = 'gradient'"gradient""gradient""gradient""gradient", it is assumed that the input contours are edges, and the normal information is obtained from the gradient direction of the edge (see edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPix). For this, the attribute 'edge_direction'"edge_direction""edge_direction""edge_direction""edge_direction" must exist for the input contour (siehe get_contour_attrib_xldget_contour_attrib_xldGetContourAttribXldGetContourAttribXldGetContourAttribXld). If ModeModeModeModemode = 'contour_normal'"contour_normal""contour_normal""contour_normal""contour_normal", a possibly existing normal information is used to determine the normals. For this, the contour attribute 'angle'"angle""angle""angle""angle" must exist (see lines_gausslines_gaussLinesGaussLinesGaussLinesGauss or edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPix). Finally, if ModeModeModeModemode = 'regression_normal'"regression_normal""regression_normal""regression_normal""regression_normal", the normal vectors are determined from a local line fit to each contour point. Here, the normal vectors are oriented such that they point to the right side of the contour when the contour is traversed from start to end. In contrast to the first two modes, this mode can be used for all XLD contours, no matter how they were generated.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

Parameters

ContoursContoursContoursContourscontours (input_object) xld_cont-array → object

Contours to be transformed.

ParallelContoursParallelContoursParallelContoursParallelContoursparallelContours (output_object) xld_cont-array → object

Parallel contours.

ModeModeModeModemode (input_control) string → (string)

Mode, with which the direction information is computed.

Default value: 'regression_normal' "regression_normal" "regression_normal" "regression_normal" "regression_normal"

Suggested values: 'gradient'"gradient""gradient""gradient""gradient", 'contour_normal'"contour_normal""contour_normal""contour_normal""contour_normal", 'regression_normal'"regression_normal""regression_normal""regression_normal""regression_normal"

DistanceDistanceDistanceDistancedistance (input_control) number → (real / integer)

Distance of the parallel contour.

Default value: 1

Suggested values: 0.2, 0.4, 0.6, 0.8, 1, 2, 3, 4, 5, 7, 10, 15, 20, 30, 40, 50

Possible Predecessors

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXld, lines_gausslines_gaussLinesGaussLinesGaussLinesGauss, lines_facetlines_facetLinesFacetLinesFacetLinesFacet, edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPix, threshold_sub_pixthreshold_sub_pixThresholdSubPixThresholdSubPixThresholdSubPix

Possible Successors

gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldGenPolygonsXld

Module

Foundation

Operators