22. Normally, the watershed is computed on the image gradient to detect
contour lines around homogeneous regions.
23. In noisy images there are normally too many minima, resulting in
a watershed oversegmentation effect.
24. Watershed oversegmentation is effectively eliminated by filtering the
image with closing, area-closing, or h-minima operators.
25. The watershed oversegmentation phenomenon can be useful to separate
homogeneous from textured regions.
26. Another way to eliminate watershed oversegmentation is by using the
watershed from markers technique, where water can flood only from
markers instead of from all regional minima.
27. The watershed-based segmentation from markers technique typically
requires inner markers for the objects and outer markers ...