top_hattop_hattop_hatTopHatTopHat (Operator)

Name

top_hattop_hattop_hatTopHatTopHat — Compute the top hat of regions.

Signature

Description

top_hattop_hattop_hatTopHatTopHat computes the openingopeningopeningOpeningOpening of RegionRegionRegionRegionregion with StructElementStructElementStructElementStructElementstructElement. The difference between the original region and the result of the opening is called the top hat. In contrast to openingopeningopeningOpeningOpening, which splits regions under certain circumstances, top_hattop_hattop_hatTopHatTopHat computes the regions removed by such a splitting.

The position of StructElementStructElementStructElementStructElementstructElement is meaningless, since an opening operation is invariant with respect to the choice of the reference point.

Structuring elements (StructElementStructElementStructElementStructElementstructElement) can be generated with operators such as gen_circlegen_circlegen_circleGenCircleGenCircle, gen_rectangle1gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1, gen_rectangle2gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2, gen_ellipsegen_ellipsegen_ellipseGenEllipseGenEllipse, draw_regiondraw_regiondraw_regionDrawRegionDrawRegion, gen_region_polygongen_region_polygongen_region_polygonGenRegionPolygonGenRegionPolygon, gen_region_pointsgen_region_pointsgen_region_pointsGenRegionPointsGenRegionPoints, etc.

Parallelization

• 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

Result

top_hattop_hattop_hatTopHatTopHat 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, connectionconnectionconnectionConnectionConnection, union1union1union1Union1Union1, watershedswatershedswatershedsWatershedsWatersheds, class_ndim_normclass_ndim_normclass_ndim_normClassNdimNormClassNdimNorm, gen_circlegen_circlegen_circleGenCircleGenCircle, gen_ellipsegen_ellipsegen_ellipseGenEllipseGenEllipse, gen_rectangle1gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1, gen_rectangle2gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2, draw_regiondraw_regiondraw_regionDrawRegionDrawRegion, gen_region_pointsgen_region_pointsgen_region_pointsGenRegionPointsGenRegionPoints, gen_struct_elementsgen_struct_elementsgen_struct_elementsGenStructElementsGenStructElements, gen_region_polygon_filledgen_region_polygon_filledgen_region_polygon_filledGenRegionPolygonFilledGenRegionPolygonFilled

Possible Successors

reduce_domainreduce_domainreduce_domainReduceDomainReduceDomain, select_shapeselect_shapeselect_shapeSelectShapeSelectShape, area_centerarea_centerarea_centerAreaCenterAreaCenter, connectionconnectionconnectionConnectionConnection

Alternatives

openingopeningopeningOpeningOpening, differencedifferencedifferenceDifferenceDifference

See also

bottom_hatbottom_hatbottom_hatBottomHatBottomHat, morph_hatmorph_hatmorph_hatMorphHatMorphHat, gray_tophatgray_tophatgray_tophatGrayTophatGrayTophat, openingopeningopeningOpeningOpening

Module

Foundation