A human face identification system based on isodensity maps has been already proposed by authers. The isodensity maps are contours of isodensity areas, therefore they can be easily transformed into a chain code. By using chain-coded isodensity contours, improvement of the processing performance can be expected in terms of the processing time and the data size required.
When the isodensity contours are expressed by chain codes, however, the chain codes corresponding to one isodensity area are occasionally divided into several parts by only using a simple encoding scheme.
Consequently, in this paper, a new chain encoding method which is adequate for extracting isodensity contours is presented.
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