Operator Reference

HALCON Operator Reference / XLD / Creation
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gen_contour_region_xldgen_contour_region_xldGenContourRegionXldGenContourRegionXldgen_contour_region_xld (Operator)

gen_contour_region_xldgen_contour_region_xldGenContourRegionXldGenContourRegionXldgen_contour_region_xld — Generate XLD contours from regions.

Signature

gen_contour_region_xld(Regions : Contours : Mode : )

Herror gen_contour_region_xld(const Hobject Regions, Hobject* Contours, const char* Mode)

Herror T_gen_contour_region_xld(const Hobject Regions, Hobject* Contours, const Htuple Mode)

void GenContourRegionXld(const HObject& Regions, HObject* Contours, const HTuple& Mode)

HXLDCont HRegion::GenContourRegionXld(const HString& Mode) const

HXLDCont HRegion::GenContourRegionXld(const char* Mode) const

HXLDCont HRegion::GenContourRegionXld(const wchar_t* Mode) const   ( Windows only)

void HXLDCont::HXLDCont(const HRegion& Regions, const HString& Mode)

void HXLDCont::HXLDCont(const HRegion& Regions, const char* Mode)

void HXLDCont::HXLDCont(const HRegion& Regions, const wchar_t* Mode)   ( Windows only)

static void HOperatorSet.GenContourRegionXld(HObject regions, out HObject contours, HTuple mode)

HXLDCont HRegion.GenContourRegionXld(string mode)

public HXLDCont(HRegion regions, string mode)

def gen_contour_region_xld(regions: HObject, mode: str) -> HObject

Description

gen_contour_region_xldgen_contour_region_xldGenContourRegionXldGenContourRegionXldgen_contour_region_xld generates XLD contours ContoursContoursContourscontourscontours from the regions given in RegionsRegionsRegionsregionsregions. This operator is useful if regions have been obtained from segmentation operations, but higher level operators, e.g., polygon approximation and extraction of parallels, are to be performed on their boundaries. For each connected component of the input regions a closed contour of the boundary is generated. The parameter ModeModeModemodemode can take on the following values:

  • 'center'"center""center""center""center": The centers of the border pixels are used as contour points.

  • 'border'"border""border""border""border": The outer border of the border pixels is used as contour points.

  • 'border_holes'"border_holes""border_holes""border_holes""border_holes": In addition to the outer border of the input region you get the contours of all holes.

The difference between the modes is demonstrated using the following region:

image/svg+xml
Example region.

Computing the contour with the different values available for ModeModeModemodemode returns the following result contours:

image/svg+xml image/svg+xml image/svg+xml
( 1) ( 2) ( 3)
Result for 'center'"center""center""center""center" (1), 'border'"border""border""border""border" (2), and 'border_holes'"border_holes""border_holes""border_holes""border_holes" mode (3).

This means, for example, that contours generated with 'border'"border""border""border""border" will in general have a much larger Euclidean length (see length_xldlength_xldLengthXldLengthXldlength_xld) than contours generated with 'center'"center""center""center""center". This results from the fact that for diagonal border elements 'border'"border""border""border""border" uses two contour segments of length 1 each, whereas 'center'"center""center""center""center" uses a single segment of length . Other features, e.g., the area (see area_center_xldarea_center_xldAreaCenterXldAreaCenterXldarea_center_xld), will obviously also have different values.

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

RegionsRegionsRegionsregionsregions (input_object)  region(-array) → objectHRegionHObjectHObjectHobject

Input regions.

ContoursContoursContourscontourscontours (output_object)  xld_cont(-array) → objectHXLDContHObjectHObjectHobject *

Resulting contours.

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

Mode of contour generation.

Default: 'border' "border" "border" "border" "border"

List of values: 'border'"border""border""border""border", 'border_holes'"border_holes""border_holes""border_holes""border_holes", 'center'"center""center""center""center"

Possible Successors

smooth_contours_xldsmooth_contours_xldSmoothContoursXldSmoothContoursXldsmooth_contours_xld, gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldgen_polygons_xld

Alternatives

gen_contour_polygon_xldgen_contour_polygon_xldGenContourPolygonXldGenContourPolygonXldgen_contour_polygon_xld, get_region_contourget_region_contourGetRegionContourGetRegionContourget_region_contour

See also

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld

Module

Foundation

ClassesClasses | | Operators