erosion_seqerosion_seqErosionSeqErosionSeqerosion_seq (Operator)

Name

erosion_seqerosion_seqErosionSeqErosionSeqerosion_seq — Erode a region sequentially.

Warning

erosion_seqerosion_seqErosionSeqErosionSeqErosionSeqerosion_seq is obsolete and is only provided for reasons of backward compatibility.

Signature

erosion_seq(Region : RegionErosion : GolayElement, Iterations : )

Description

erosion_seqerosion_seqErosionSeqErosionSeqErosionSeqerosion_seq computes the sequential erosion of the input region RegionRegionRegionRegionregionregion with the selected structuring element GolayElementGolayElementGolayElementGolayElementgolayElementgolay_element from the Golay alphabet. This is done by executing the operator erosion_golayerosion_golayErosionGolayErosionGolayErosionGolayerosion_golay with all rotations of the structuring element IterationsIterationsIterationsIterationsiterationsiterations 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_elementsGolayElementsGolayElementsGolayElementsgolay_elements.

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 eroded.

RegionErosionRegionErosionRegionErosionRegionErosionregionErosionregion_erosion (output_object) region(-array) → object

Eroded regions.

GolayElementGolayElementGolayElementGolayElementgolayElementgolay_element (input_control) string → (string)

Structuring element from the Golay alphabet.

Default value: 'h' "h" "h" "h" "h" "h"

List of values: 'c'"c""c""c""c""c", 'd'"d""d""d""d""d", 'f'"f""f""f""f""f", 'h'"h""h""h""h""h", 'k'"k""k""k""k""k", 'l'"l""l""l""l""l"

IterationsIterationsIterationsIterationsiterationsiterations (input_control) integer → (integer)

Number of iterations.

Default value: 1

Suggested values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 20, 30, 40, 50

Typical range of values: 1 ≤ Iterations Iterations Iterations Iterations iterations iterations (lin)

Minimum increment: 1

Recommended increment: 1

Complexity

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

Result

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