Morphology on orientation images
We would like to use mathematical morphology on these orientation images (i.e. with pixels distributed on the unit circle)
Problem:
- The unit circle has no order of importance and no dominant position
- Hence it is impossible to define the maximum and minimum in the region covered by a structuring element
To solve this problem, we have developed two rotationally invariant morphological operators, the circular centred top-hat, and the labelled opening.