Character recognition method

Details Character recognition method Character recognition method

1987-07-02

1990-02-20

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 9, 382 18, 382 19, G06K 956

Patent

active

049033131

ABSTRACT:
A character recognition method includes a step of assigning one of a plurality of predetermined directionality codes to each of the pixels defining the contour of a character pattern. Then, the character pattern, to which the directionality codes have been assigned, is subdivided into a plurality of mesh regions. In this case, in accordance with the present invention, the character pattern is not directly subdivided into mesh regions, and, instead, the character pattern is first subdivided into a first plurality of sub-regions and then the first plurality of sub-regions are converted into a second plurality, which is smaller in number than the first plurality, of mesh regions by combining at least some of said first plurality of sub-regions. Such a two-step subdivision process of a character pattern is advantageous in absorbing fluctuations caused by modifications of the character pattern, such as hand-written characters.

REFERENCES:
patent: 3936800 (1976-02-01), Ejiri et al.
patent: 4288779 (1981-09-01), Otsu et al.
patent: 4525859 (1985-06-01), Bowles et al.
patent: 4700400 (1987-10-01), Ross
patent: 4723298 (1988-02-01), Schiller
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4757551 (1988-07-01), Kobayashi et al.

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