Character recognition apparatus that subdivides a character into

Details Character recognition apparatus that subdivides a character into Character recognition apparatus that subdivides a character into

1994-10-31

1997-12-30

Boudreau, Leo

Image analysis

Pattern recognition

Feature extraction

382264, 382170, 382199, 382205, G06K 948, G06K 956, G06K 962, G06K 938

Patent

active

057039631

ABSTRACT:
A character recognition apparatus is provided which, even when there occurs a local positional deviation of a character to be recognized, can stably recognize the character with high accuracy. For each contour point of a character image, a contouring direction code imparting unit 15 obtains a contouring direction code in which a contouring line direction of the character is quantized in four directions. A contouring direction code frequency calculation unit 16 calculates the frequency of each contouring direction code for each subregion of the character image. A contouring direction code density calculation unit 17 calculates the density of the contouring direction codes of each subregion, by using the frequency of the direction codes and the size of the respective subregion. A contouring direction code space blurring unit 18 conducts a weighted addition on each of the obtained contouring direction codes by adding, with a predetermined weight coefficient, the contouring direction code densities of neighbor subregions which are adjacent to the respective subregion with the subregion as the center and in a direction perpendicular to that of each of the contouring direction codes.

REFERENCES:
patent: 4757551 (1988-07-01), Kobayashi et al.
patent: 4903312 (1990-02-01), Sato
patent: 4903313 (1990-02-01), Tachikawa
patent: 4959870 (1990-09-01), Tachikawa
Patent Abstracts of Japan, vol. 7, No. 234 (P-230), Oct. 18, 1983, Patent No. JP-A-58123175 (Oki Denki Kogyo KK), Yamashita Yoshiyuki, et al., Issued Jul. 22, 1983, Abstract.

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