VTK/Image Connectivity

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A connectivity filter examines the connectivity between the elements in a data set, in order to produce "connected regions", where each connected region is a set of elements that are connected to each other but not to other regions. For mesh data, VTK provides the vtkPolyDataConnectivityFilter and the generic vtkConnectivityFilter for separating a data set into connected regions. This page describes the vtkImageConnectivityFilter, which serves the same purpose for image data.

VTK already has other connectivity filters, two of which the vtkImageConnectivityFilter aims to replace:

  • vtkImageIslandRemoval2D - very old filter, requires a 2D label image as input
  • vtkImagSeedConnectivity - very old filter, requires a label image as input

The API of vtkImageConnectivityFilter is intentionally similar to the generic vtkConnectivityFilter, but it produces a vtkImageData output instead of producing a vtkUnstructuredGrid.

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