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Testing & Debugging Suggestions

Synthetic test images​

Create synthetic test images that exercise corner cases:

  • Single pixel islands
  • Long 1-pixel-wide arms (test minWidth/minHeight)
  • Two large regions separated by thin small islands
  • Diagonal-touching shapes (to test 4 vs 8 connectivity)

Visualization of labels map​

Visualize the labels map (map labels to colors) to ensure connected components are being formed as expected.

Unit tests​

Assert that the number of pixels of a known large blob is unchanged; assert that small isolated pixels have been recolored.

Instrumentation​

Collect histogram of region sizes to choose appropriate minArea.