closing_circleclosing_circleClosingCircleClosingCircleclosing_circle (Operator)

Name

closing_circleclosing_circleClosingCircleClosingCircleclosing_circle — Close a region with a circular structuring element.

Signature

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

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:

• 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, 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

See also

dilation1dilation1Dilation1Dilation1dilation1, minkowski_sub1minkowski_sub1MinkowskiSub1MinkowskiSub1minkowski_sub1, erosion1erosion1Erosion1Erosion1erosion1, openingopeningOpeningOpeningopening

Module

Foundation