Operator Reference

HALCON Operator Reference / Morphology / Region

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erosion2erosion2Erosion2Erosion2erosion2 (Operator)

erosion2erosion2Erosion2Erosion2erosion2 — Erode a region (using a reference point).

Signature

erosion2(Region, StructElement : RegionErosion : Row, Column, Iterations : )

Herror erosion2(const Hobject Region, const Hobject StructElement, Hobject* RegionErosion, const Hlong Row, const Hlong Column, const Hlong Iterations)

Herror T_erosion2(const Hobject Region, const Hobject StructElement, Hobject* RegionErosion, const Htuple Row, const Htuple Column, const Htuple Iterations)

void Erosion2(const HObject& Region, const HObject& StructElement, HObject* RegionErosion, const HTuple& Row, const HTuple& Column, const HTuple& Iterations)

HRegion HRegion::Erosion2(const HRegion& StructElement, Hlong Row, Hlong Column, Hlong Iterations) const

static void HOperatorSet.Erosion2(HObject region, HObject structElement, out HObject regionErosion, HTuple row, HTuple column, HTuple iterations)

HRegion HRegion.Erosion2(HRegion structElement, int row, int column, int iterations)

def erosion2(region: HObject, struct_element: HObject, row: int, column: int, iterations: int) -> HObject

Description

erosion2erosion2Erosion2Erosion2erosion2 erodes the input regions with a structuring element (StructElementStructElementStructElementstructElementstruct_element) having the reference point (RowRowRowrowrow,ColumnColumnColumncolumncolumn). erosion2erosion2Erosion2Erosion2erosion2 has a similar effect as erosion1erosion1Erosion1Erosion1erosion1, the difference is that the reference point of the structuring element can be chosen arbitrarily. The parameter IterationsIterationsIterationsiterationsiterations determines the number of iterations which are to be performed with the structuring element. The result of iteration n-1 is used as input for iteration n.

A maximum region is generated in case of an empty structuring element.

Structuring elements (StructElementStructElementStructElementstructElementstruct_element) can be generated with operators such as gen_circlegen_circleGenCircleGenCirclegen_circle, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1gen_rectangle1, gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2gen_rectangle2, gen_ellipsegen_ellipseGenEllipseGenEllipsegen_ellipse, draw_regiondraw_regionDrawRegionDrawRegiondraw_region, gen_region_polygongen_region_polygonGenRegionPolygonGenRegionPolygongen_region_polygon, gen_region_pointsgen_region_pointsGenRegionPointsGenRegionPointsgen_region_points, etc.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Automatically parallelized on tuple level.

Parameters

RegionRegionRegionregionregion (input_object)  region(-array) → objectHRegionHObjectHObjectHobject

Regions to be eroded.

StructElementStructElementStructElementstructElementstruct_element (input_object)  region → objectHRegionHObjectHObjectHobject

Structuring element.

RegionErosionRegionErosionRegionErosionregionErosionregion_erosion (output_object)  region(-array) → objectHRegionHObjectHObjectHobject *

Eroded regions.

RowRowRowrowrow (input_control)  point.y → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row coordinate of the reference point.

Default: 0

Value range: 0 ≤ Row Row Row row row ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

ColumnColumnColumncolumncolumn (input_control)  point.x → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column coordinate of the reference point.

Default: 0

Value range: 0 ≤ Column Column Column column column ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

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

Number of iterations.

Default: 1

Suggested values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 20, 30, 40, 50

Value range: 1 ≤ Iterations Iterations Iterations iterations iterations (lin)

Minimum increment: 1

Recommended increment: 1

Complexity

Let F1 be the area of the input region, and F2 be the area of the structuring element. Then the runtime complexity for one region is:

Result

erosion2erosion2Erosion2Erosion2erosion2 returns 2 ( H_MSG_TRUE) if all parameters are correct. The behavior in case of empty or no input region can be set via:

• no region: set_system('no_object_result',<RegionResult>)set_system("no_object_result",<RegionResult>)SetSystem("no_object_result",<RegionResult>)SetSystem("no_object_result",<RegionResult>)set_system("no_object_result",<RegionResult>)

• empty region: set_system('empty_region_result',<RegionResult>)set_system("empty_region_result",<RegionResult>)SetSystem("empty_region_result",<RegionResult>)SetSystem("empty_region_result",<RegionResult>)set_system("empty_region_result",<RegionResult>)

Otherwise, an exception is raised.

Possible Predecessors

thresholdthresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingregiongrowing, watershedswatershedsWatershedsWatershedswatersheds, class_ndim_normclass_ndim_normClassNdimNormClassNdimNormclass_ndim_norm, gen_circlegen_circleGenCircleGenCirclegen_circle, gen_ellipsegen_ellipseGenEllipseGenEllipsegen_ellipse, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1gen_rectangle1, gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2gen_rectangle2, draw_regiondraw_regionDrawRegionDrawRegiondraw_region, gen_region_pointsgen_region_pointsGenRegionPointsGenRegionPointsgen_region_points, gen_region_polygon_filledgen_region_polygon_filledGenRegionPolygonFilledGenRegionPolygonFilledgen_region_polygon_filled

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, select_shapeselect_shapeSelectShapeSelectShapeselect_shape, area_centerarea_centerAreaCenterAreaCenterarea_center, connectionconnectionConnectionConnectionconnection

Alternatives

minkowski_sub2minkowski_sub2MinkowskiSub2MinkowskiSub2minkowski_sub2, minkowski_sub1minkowski_sub1MinkowskiSub1MinkowskiSub1minkowski_sub1, erosion1erosion1Erosion1Erosion1erosion1

See also

transpose_regiontranspose_regionTransposeRegionTransposeRegiontranspose_region, gen_circlegen_circleGenCircleGenCirclegen_circle, gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2gen_rectangle2, gen_region_polygongen_region_polygonGenRegionPolygonGenRegionPolygongen_region_polygon

Module

Foundation

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