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Another way of extracting and representing information from an image is to group pixels together into regions of similarity. This process is commonly called segmentation. In

-- we would group pixels together according to the rate of change of their intensity over a region.

-- we group together pixels according to the rate of change of depth in the image, corresponding to pixels lying on the same surface such as a plane, cylinder, sphere etc.

There are two main approaches to segmentation.

tex2html_wrap_inline2984 David Marshall 1994-1997