Operator Reference

HALCON Operator Reference / Legacy / Morphology

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thinningthinningThinningThinningthinning (Operator)

thinningthinningThinningThinningthinning — Remove the result of a hit-or-miss operation from a region.

Warning

thinningthinningThinningThinningthinning is obsolete and is only provided for reasons of backward compatibility.

Signature

thinning(Region, StructElement1, StructElement2 : RegionThin : Row, Column, Iterations : )

Herror thinning(const Hobject Region, const Hobject StructElement1, const Hobject StructElement2, Hobject* RegionThin, const Hlong Row, const Hlong Column, const Hlong Iterations)

Herror T_thinning(const Hobject Region, const Hobject StructElement1, const Hobject StructElement2, Hobject* RegionThin, const Htuple Row, const Htuple Column, const Htuple Iterations)

void Thinning(const HObject& Region, const HObject& StructElement1, const HObject& StructElement2, HObject* RegionThin, const HTuple& Row, const HTuple& Column, const HTuple& Iterations)

HRegion HRegion::Thinning(const HRegion& StructElement1, const HRegion& StructElement2, Hlong Row, Hlong Column, Hlong Iterations) const

static void HOperatorSet.Thinning(HObject region, HObject structElement1, HObject structElement2, out HObject regionThin, HTuple row, HTuple column, HTuple iterations)

HRegion HRegion.Thinning(HRegion structElement1, HRegion structElement2, int row, int column, int iterations)

def thinning(region: HObject, struct_element_1: HObject, struct_element_2: HObject, row: int, column: int, iterations: int) -> HObject

Description

thinningthinningThinningThinningthinning performs a thinning of the input regions using morphological operations. The operator first applies a hit-or-miss-transformation to RegionRegionRegionregionregion (cf. hit_or_misshit_or_missHitOrMissHitOrMisshit_or_miss), and then removes the detected points from the input region. The parameter IterationsIterationsIterationsiterationsiterations determines the number of iterations performed.

For the choice of the structuring elements StructElement1StructElement1StructElement1structElement1struct_element_1 and StructElement2StructElement2StructElement2structElement2struct_element_2, as well as for RowRowRowrowrow and ColumnColumnColumncolumncolumn, the same restrictions described under hit_or_misshit_or_missHitOrMissHitOrMisshit_or_miss apply.

Structuring elements (StructElement1StructElement1StructElement1structElement1struct_element_1, StructElement2StructElement2StructElement2structElement2struct_element_2) 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 processed.

StructElement1StructElement1StructElement1structElement1struct_element_1 (input_object)  region → objectHRegionHObjectHObjectHobject

Structuring element for the foreground.

StructElement2StructElement2StructElement2structElement2struct_element_2 (input_object)  region → objectHRegionHObjectHObjectHobject

Structuring element for the background.

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

Result of the thinning operator.

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 F be the area of an input region, F1 the area of the structuring element 1, and F2 the area of the structuring element 2. Then the runtime complexity for one object is:

Result

thinningthinningThinningThinningthinning 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, connectionconnectionConnectionConnectionconnection, union1union1Union1Union1union1, 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

thinning_golaythinning_golayThinningGolayThinningGolaythinning_golay, thinning_seqthinning_seqThinningSeqThinningSeqthinning_seq

See also

hit_or_misshit_or_missHitOrMissHitOrMisshit_or_miss

Module

Foundation

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ClassesClasses | | Operators