erosion_seqerosion_seqerosion_seqErosionSeqErosionSeq (Operator)

Name

erosion_seqerosion_seqerosion_seqErosionSeqErosionSeq — Erode a region sequentially.

Signature

Description

erosion_seqerosion_seqerosion_seqErosionSeqErosionSeq computes the sequential erosion of the input region RegionRegionRegionRegionregion with the selected structuring element GolayElementGolayElementGolayElementGolayElementgolayElement from the Golay alphabet. This is done by executing the operator erosion_golayerosion_golayerosion_golayErosionGolayErosionGolay with all rotations of the structuring element IterationsIterationsIterationsIterationsiterations times. The following structuring elements can be selected:

'l', 'd', 'c', 'f', 'h', 'k'.

Only the “foreground elements” (even rotation numbers) are used. The elements 'i' and 'e' result in unchanged output regions. The elements 'l', 'm' and 'f2' are identical for the foreground. The Golay elements, together with all possible rotations, are described with the operator golay_elementsgolay_elementsgolay_elementsGolayElementsGolayElements.

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

Complexity

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

       O(Iterations * 20 * sqrt(F)) .

Result

erosion_seqerosion_seqerosion_seqErosionSeqErosionSeq 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_normclass_ndim_normClassNdimNormClassNdimNorm

Possible Successors

connectionconnectionconnectionConnectionConnection, reduce_domainreduce_domainreduce_domainReduceDomainReduceDomain, select_shapeselect_shapeselect_shapeSelectShapeSelectShape, area_centerarea_centerarea_centerAreaCenterAreaCenter

Alternatives

erosion_golayerosion_golayerosion_golayErosionGolayErosionGolay, erosion1erosion1erosion1Erosion1Erosion1, erosion2erosion2erosion2Erosion2Erosion2

See also

dilation_seqdilation_seqdilation_seqDilationSeqDilationSeq, hit_or_miss_seqhit_or_miss_seqhit_or_miss_seqHitOrMissSeqHitOrMissSeq, thinning_seqthinning_seqthinning_seqThinningSeqThinningSeq

Module

Foundation