I have written an <a href="http://dip4fish.blogspot.com/2011/04/hit-and-miss-skeleton-and-convex-hull.html">buggy implementation</a>. The idea is:<br><ol><li>find the corners of the contour</li><li>add them to the particle</li><li>do it again</li><li>up to idempotence</li></ol><br>but it fails ...<br>An issue for me is how to handle the "don't care" points (pixels) with ndimage hit or miss operator.<br><br>Regards <br>Jean-Patrick<br>