Method and apparatus for extracting outline data from bi-level i

Details Method and apparatus for extracting outline data from bi-level i Method and apparatus for extracting outline data from bi-level i

1996-01-23

1997-09-09

Boudreau, Leo

Image analysis

Pattern recognition

Feature extraction

382316, G06K 948

Patent

active

056664400

ABSTRACT:
A bi-level image is represented by an array of pixels. Code words are generated which represent outline tracing directions defined at points between the pixels respectively. The outline tracing directions represented by the code words are determined in accordance with states of the pixels surrounding and adjoining the related points respectively. A movement from one of the points to another being one of neighboring points is performed in accordance with the outline tracing direction represented by the code word defined at the one of the points. The movement-performing is repeated to trace an outline of a region in the bi-level image. Data representing the traced outline is generated in accordance with addresses of the points along which the movements are performed.

REFERENCES:
patent: 3899771 (1975-08-01), Saraga et al.
patent: 4773098 (1988-09-01), Scott
patent: 4833721 (1989-05-01), Okutomi et al.
patent: 4956869 (1990-09-01), Mikatake et al.
patent: 5018216 (1991-05-01), Kojima
patent: 5182777 (1993-01-01), Nakayama et al.
patent: 5195147 (1993-03-01), Ohta

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