ITKMorphologicalWatershedFromMarkersImageFilter wrapper is incomplete (no marker-image input)

[imikejackson]

Summary

The ITKMorphologicalWatershedFromMarkersImageFilter wrapper is incomplete: a marker-controlled watershed requires two inputs, but the simplnx wrapper exposes only one.

Details

ITK's itk::MorphologicalWatershedFromMarkersImageFilter takes two images:

1. the image to flood (typically a gradient/edge image), and
2. a marker (seed) label image that imposes the minima and supplies the output labels.

The simplnx wrapper (src/Plugins/ITKImageProcessing/src/ITKImageProcessing/Filters/ITKMorphologicalWatershedFromMarkersImageFilter.{hpp,cpp}, UUID 9bfcf09b-b510-4d46-982c-d2e35dedefdf) only exposes a single Input Cell Data array (k_InputImageDataPath_Key) plus Mark Watershed Line and Fully Connected. There is no parameter for the marker image, so as wrapped the filter cannot perform a marker-controlled watershed.

Current state

• The filter is already excluded from the build: it is not in the active FilterList in src/Plugins/ITKImageProcessing/CMakeLists.txt (only a commented entry, in the "These filters need to have their type or dimension fixed" section). create_simplnx_plugin compiles strictly from FilterList, so the filter is neither compiled nor registered.
• However, the orphaned source files (.hpp/.cpp) and a documentation page (src/Plugins/ITKImageProcessing/docs/ITKMorphologicalWatershedFromMarkersImageFilter.md) remain in the repository. The doc is still published even though the filter is not shipped.

Recommendation

Either:

• (a) complete the wrapper so it accepts a separate marker (label) image input, then re-enable it in FilterList; or
• (b) remove the orphaned source and documentation files if the filter is not going to be supported.

Found during the Batch 8 ITK documentation review.