Operator Reference

HALCON Operator Reference / XLD / Creation
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gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld (Operator)

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld — Convert a skeleton into XLD contours.

Signature

gen_contours_skeleton_xld(Skeleton : Contours : Length, Mode : )

Herror gen_contours_skeleton_xld(const Hobject Skeleton, Hobject* Contours, const Hlong Length, const char* Mode)

Herror T_gen_contours_skeleton_xld(const Hobject Skeleton, Hobject* Contours, const Htuple Length, const Htuple Mode)

void GenContoursSkeletonXld(const HObject& Skeleton, HObject* Contours, const HTuple& Length, const HTuple& Mode)

HXLDCont HRegion::GenContoursSkeletonXld(Hlong Length, const HString& Mode) const

HXLDCont HRegion::GenContoursSkeletonXld(Hlong Length, const char* Mode) const

HXLDCont HRegion::GenContoursSkeletonXld(Hlong Length, const wchar_t* Mode) const   ( Windows only)

static void HOperatorSet.GenContoursSkeletonXld(HObject skeleton, out HObject contours, HTuple length, HTuple mode)

HXLDCont HRegion.GenContoursSkeletonXld(int length, string mode)

def gen_contours_skeleton_xld(skeleton: HObject, length: int, mode: str) -> HObject

Description

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld converts the input skeleton (e.g., edges) SkeletonSkeletonSkeletonskeletonskeleton, which is assumed to contain mostly one pixel wide regions (see skeletonskeletonSkeletonSkeletonskeleton), 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_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_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 LengthLengthLengthlengthlength 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 LengthLengthLengthlengthlength points, if ModeModeModemodemode = 'filter'"filter""filter""filter""filter" was selected. This can be avoided by setting ModeModeModemodemode = 'generalize1'"generalize1""generalize1""generalize1""generalize1". In this case, the contours are generated as if the segments shorter than LengthLengthLengthlengthlength 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, ModeModeModemodemode = '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 LengthLengthLengthlengthlength.

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

SkeletonSkeletonSkeletonskeletonskeleton (input_object)  region → objectHRegionHObjectHObjectHobject

Skeleton of which the contours are to be determined.

ContoursContoursContourscontourscontours (output_object)  xld_cont-array → objectHXLDContHObjectHObjectHobject *

Resulting contours.

LengthLengthLengthlengthlength (input_control)  integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Minimum number of points a contour has to have.

Default: 1

Suggested values: 1, 2, 3, 5, 10, 20

ModeModeModemodemode (input_control)  string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Contour filter mode.

Default: 'filter' "filter" "filter" "filter" "filter"

List of values: 'filter'"filter""filter""filter""filter", 'generalize1'"generalize1""generalize1""generalize1""generalize1", 'generalize2'"generalize2""generalize2""generalize2""generalize2"

Possible Predecessors

skeletonskeletonSkeletonSkeletonskeleton

Possible Successors

smooth_contours_xldsmooth_contours_xldSmoothContoursXldSmoothContoursXldsmooth_contours_xld, get_contour_xldget_contour_xldGetContourXldGetContourXldget_contour_xld, gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldgen_polygons_xld

See also

edges_imageedges_imageEdgesImageEdgesImageedges_image, thresholdthresholdThresholdThresholdthreshold, get_region_contourget_region_contourGetRegionContourGetRegionContourget_region_contour

Module

Foundation

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