Picture encoding method and apparatus and picture decoding metho

Details Picture encoding method and apparatus and picture decoding metho Picture encoding method and apparatus and picture decoding metho

1995-12-07

1998-01-27

Lee, Thomas D.

Image analysis

Image compression or coding

Contour or chain coding

358426, G06K 936

Patent

active

057129282

ABSTRACT:
In a picture encoding and decoding method and apparatus, an object contour can be chain coded precisely even in the case where noise exists in the vicinity of object contour, and the object contour branched off can be coded with small quantity of codes. In the case where the branched part occurs in a feature point chain, by multiplexing branch code D1 to chain codes S23 and S22 and expressing as a tree structured feature point chain including the branch part of the object contour, an increase in number of chains can be controlled and the efficient chain coding can be conducted. Moreover, since the terminal branch chains having no branch point in the chain become the objects of thresholding, only noise elements can be effectively eliminated without cutting off the feature point chain showing the object contours.

REFERENCES:
patent: 3863218 (1975-01-01), Oka et al.
patent: 4628532 (1986-12-01), Stone et al.

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