Operator Reference

HALCON Operator Reference / Morphology / Region

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opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 (Operator)

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 — Open a region with a rectangular structuring element.

Signature

opening_rectangle1(Region : RegionOpening : Width, Height : )

Herror opening_rectangle1(const Hobject Region, Hobject* RegionOpening, const Hlong Width, const Hlong Height)

Herror T_opening_rectangle1(const Hobject Region, Hobject* RegionOpening, const Htuple Width, const Htuple Height)

void OpeningRectangle1(const HObject& Region, HObject* RegionOpening, const HTuple& Width, const HTuple& Height)

HRegion HRegion::OpeningRectangle1(Hlong Width, Hlong Height) const

static void HOperatorSet.OpeningRectangle1(HObject region, out HObject regionOpening, HTuple width, HTuple height)

HRegion HRegion.OpeningRectangle1(int width, int height)

def opening_rectangle1(region: HObject, width: int, height: int) -> HObject

Description

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 behaves as openingopeningOpeningOpeningopening with a rectangular structuring element 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.

Similar to erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1erosion_rectangle1 and dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1dilation_rectangle1 opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 is a very fast operation.

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 opened.

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

Opened regions.

WidthWidthWidthwidthwidth (input_control)  extent.x → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Width of the structuring rectangle.

Default: 10

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

Value range: 1 ≤ Width Width Width width width ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

HeightHeightHeightheightheight (input_control)  extent.y → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Height of the structuring rectangle.

Default: 10

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

Value range: 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:

Result

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 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

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, select_shapeselect_shapeSelectShapeSelectShapeselect_shape, area_centerarea_centerAreaCenterAreaCenterarea_center, connectionconnectionConnectionConnectionconnection

Alternatives

openingopeningOpeningOpeningopening, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1gen_rectangle1, dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1dilation_rectangle1, erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1erosion_rectangle1

Module

Foundation

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ClassesClasses | | Operators