Pre-Processing > Highlight Lines

Uses the Frangi filter [1] to highlight linear-type features in the image. Combine with a threshold afterwards to select certain linear-type features.

1. Type

  • Dark: Highlight dark linear-type features
  • Bright: Highlight bright linear-type features

2. Thickness

Factor which controls the thickness of the lines that are targeted (Recommended: 1-3)

3. Strength

Factor which controls the strength of the Frangi (line-highlighting) filter (Recommended: 1-3)


  • Useful for identifying continuous lines in an image. Image pre-processing is recommended to reduce noise when using this function.


[1] Frangi, Alejandro F., Wiro J. Niessen, Koen L. Vincken, and Max A. Viergever. “Multiscale vessel enhancement filtering.” In International Conference on Medical Image Computing and Computer-Assisted Intervention, pp. 130-137. Springer Berlin Heidelberg, 1998.

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