By duality, a regional minimum is a flat connected region that is at the bottom of
a basin. Regional maxima and minima are generically called extrema of the
image.
RMIN
E
( f ) ¼ HMIN
1,E
( f ) f (8:23)
8.3.4.7 Regional Extrema as Markers
The watershed transform, described in Section 8.4, is an important morpho-
logical segmentation process. One of the crucial steps in watershed transform
segmentation is marker extraction. A marker must be placed inside every object
that needs to be extracted. The regional maxima (minima) can be used as
markers for watershed segmentation. Marker finding, using the regional max-
ima, is most effective when done on filtered images. One advantage of this
method is its independence of any grayscale thresholding values.
Typically, ...