HALCON Reference Manual 10.0.2

opening_rectangle1opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 (Operator)

Name

opening_rectangle1opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 — Open a region with a rectangular structuring element.

Signature

opening_rectangle1(Region : RegionOpening : Width, Height : )

Description

opening_rectangle1opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 performs an erosion_rectangle1erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1 followed by a dilation_rectangle1dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1 on the input region RegionRegionRegionRegionregion. The size of the rectangular structuring element is determined by the parameters WidthWidthWidthWidthwidth and HeightHeightHeightHeightheight. As is the case for all openingopeningopeningOpeningOpening variants, larger structures are preserved, while small regions like lines or points are eliminated.

Parallelization

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) → object

Regions to be opened.

RegionOpeningRegionOpeningRegionOpeningRegionOpeningregionOpening (output_object) region(-array) → object

Opened regions.

WidthWidthWidthWidthwidth (input_control) extent.x → (integer / real)

Width of the structuring rectangle.

Default value: 10

Suggested values: 1, 2, 3, 4, 5, 7, 9, 12, 15, 19, 25, 33, 45, 60, 110, 150, 200

Typical range of values: 1 ≤ Width Width Width Width width ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

HeightHeightHeightHeightheight (input_control) extent.y → (integer / real)

Height of the structuring rectangle.

Default value: 10

Suggested values: 1, 2, 3, 4, 5, 7, 9, 12, 15, 19, 25, 33, 45, 60, 110, 150, 200

Typical range of values: 1 ≤ Height Height Height Height height ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

Complexity

Let F1 be the area of an input region and H be the height of the rectangle. Then the runtime complexity for one region is:

       O(2 * sqrt(F1) * ld(H)) .

opening_rectangle1opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 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>)

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

Otherwise, an exception is raised.

Possible Predecessors

thresholdthresholdthresholdThresholdThreshold, regiongrowingregiongrowingregiongrowingRegiongrowingRegiongrowing, watershedswatershedswatershedsWatershedsWatersheds, class_ndim_normclass_ndim_normclass_ndim_normClassNdimNormClassNdimNorm

Possible Successors

reduce_domainreduce_domainreduce_domainReduceDomainReduceDomain, select_shapeselect_shapeselect_shapeSelectShapeSelectShape, area_centerarea_centerarea_centerAreaCenterAreaCenter, connectionconnectionconnectionConnectionConnection

Alternatives

openingopeningopeningOpeningOpening, gen_rectangle1gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1, dilation_rectangle1dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1, erosion_rectangle1erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1

Module

Foundation

Table of Contents / Morphology / Region

Operators

HALCON Reference Manual 10.0.2