opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 (Operator)

Name

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 — Open a region with a rectangular structuring element.

Signature

opening_rectangle1(Region : RegionOpening : Width, Height : )

Description

opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 behaves as openingopeningOpeningOpeningOpeningopening with a rectangular structuring element on the input region RegionRegionRegionRegionregionregion. The size of the rectangular structuring element is determined by the parameters WidthWidthWidthWidthwidthwidth and HeightHeightHeightHeightheightheight. As is the case for all openingopeningOpeningOpeningOpeningopening variants, larger structures are preserved, while small regions like lines or points are eliminated.

Similar to erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1ErosionRectangle1erosion_rectangle1 and dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1DilationRectangle1dilation_rectangle1 opening_rectangle1opening_rectangle1OpeningRectangle1OpeningRectangle1OpeningRectangle1opening_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

RegionRegionRegionRegionregionregion (input_object) region(-array) → object

Regions to be opened.

RegionOpeningRegionOpeningRegionOpeningRegionOpeningregionOpeningregion_opening (output_object) region(-array) → object

Opened regions.

WidthWidthWidthWidthwidthwidth (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 width ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

HeightHeightHeightHeightheightheight (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 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_rectangle1OpeningRectangle1OpeningRectangle1OpeningRectangle1opening_rectangle1 returns TRUE if all parameters are correct. The behavior in case of empty or no input region can be set via:

Otherwise, an exception is raised.

Possible Predecessors

thresholdthresholdThresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, watershedswatershedsWatershedsWatershedsWatershedswatersheds, class_ndim_normclass_ndim_normClassNdimNormClassNdimNormClassNdimNormclass_ndim_norm

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape, area_centerarea_centerAreaCenterAreaCenterAreaCenterarea_center, connectionconnectionConnectionConnectionConnectionconnection

Alternatives

openingopeningOpeningOpeningOpeningopening, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1gen_rectangle1, dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1DilationRectangle1dilation_rectangle1, erosion_rectangle1erosion_rectangle1ErosionRectangle1ErosionRectangle1ErosionRectangle1erosion_rectangle1

Module

Foundation

Operators