closing_circleclosing_circleClosingCircleClosingCircleclosing_circle (Operator)

Name

closing_circleclosing_circleClosingCircleClosingCircleclosing_circle — Close a region with a circular structuring element.

Signature

closing_circle(Region : RegionClosing : Radius : )

Description

closing_circleclosing_circleClosingCircleClosingCircleclosing_circle behaves analogously to closingclosingClosingClosingclosing, i.e., the regions' boundaries are smoothed and holes within a region which are smaller than the circular structuring element of radius RadiusRadiusRadiusradiusradius are closed. The closing_circleclosing_circleClosingCircleClosingCircleclosing_circle operation is defined as a dilation followed by a Minkowski subtraction, both with the same circular structuring element.

Attention

closing_circleclosing_circleClosingCircleClosingCircleclosing_circle is applied to each input region separately. If gaps between different regions are to be closed, union1union1Union1Union1union1 or union2union2Union2Union2union2 has to be called first.

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 closed.

RegionClosingRegionClosingRegionClosingregionClosingregion_closing (output_object) region(-array) → object

Closed regions.

RadiusRadiusRadiusradiusradius (input_control) real → (real / integer)

Radius of the circular structuring element.

Default: 3.5

Suggested values: 1.5, 2.5, 3.5, 4.5, 5.5, 7.5, 9.5, 12.5, 15.5, 19.5, 25.5, 33.5, 45.5, 60.5, 110.5

Value range: 0.5 ≤ Radius Radius Radius radius radius ≤ 511.5 (lin)

Minimum increment: 1.0

Recommended increment: 1.0

Example (C)

my_closing_circle(Hobject In, double Radius, Hobject *Out)
{
  Hobject  tmp, StructElement;
  gen_circle(StructElement,100.0,100.0,Radius);
  dilation1(In,StructElement,&tmp,1);
  minkowski_sub1(tmp,StructElement,Out,1);
}

Complexity

Let F1 be the area of the input region. Then the runtime complexity for one region is:

Result

closing_circleclosing_circleClosingCircleClosingCircleclosing_circle returns 2 ( H_MSG_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

thresholdthresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingregiongrowing, connectionconnectionConnectionConnectionconnection, union1union1Union1Union1union1, watershedswatershedsWatershedsWatershedswatersheds, class_ndim_normclass_ndim_normClassNdimNormClassNdimNormclass_ndim_norm

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, select_shapeselect_shapeSelectShapeSelectShapeselect_shape, area_centerarea_centerAreaCenterAreaCenterarea_center, connectionconnectionConnectionConnectionconnection

Alternatives

rank_regionrank_regionRankRegionRankRegionrank_region, fill_upfill_upFillUpFillUpfill_up, closingclosingClosingClosingclosing

Module

Foundation

Operators