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RegionBoundaries

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Module: FoundationBasic

Removes interior pixels from a region.

Name Type Description
Input value
 inRegion Region Input region
Input value
 inConnectivity RegionConnectivity Type of connectivity used for the region foreground
Output value
 outRegion Region Output region

Description

The operation removes all internal pixels from the region (thus leaving only the boundary pixels). The definition of internal pixel depends on the inConnectivity value:

  • If inConnectivity is set to Four directions, internal pixels are those having neighbours in all four major directions (up, down, left, right) also contained in the region
  • If inConnectivity is set to Eight directions, internal pixels are those having neighbours in all eight directions (four major + four diagonal) also contained in the region

Examples

RegionBoundaries run on a sample region.

Complexity Level

This filter is available on Advanced Complexity Level.

See Also

  • RegionContours – Computes an array of closed paths corresponding to the contours of the input region.