opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 (Operator)

Name

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1 — Open a region with a rectangular structuring element.

Signature

opening_rectangle1(Region : RegionOpening : Width, Height : )

Description

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1OpeningRectangle1 performs an erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1ErosionRectangle1 followed by a dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1DilationRectangle1 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.

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) → object

Regions to be opened.

RegionOpeningRegionOpeningRegionOpeningRegionOpeningregionOpening (output_object) region(-array) → object

Opened regions.

WidthWidthWidthWidthwidth (input_control) extent.x → (integer)

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)

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:

Result

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1OpeningRectangle1 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_normClassNdimNormClassNdimNormClassNdimNorm

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, select_shapeselect_shapeSelectShapeSelectShapeSelectShape, area_centerarea_centerAreaCenterAreaCenterAreaCenter, connectionconnectionConnectionConnectionConnection

Alternatives

openingopeningOpeningOpeningOpening, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1, dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1DilationRectangle1, erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1ErosionRectangle1

Module

Foundation

Operators