System for segmenting character components

Details System for segmenting character components System for segmenting character components

1987-05-21

1988-10-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 18, 382 48, G06K 934

Patent

active

047760249

ABSTRACT:
A system and method for electronically segmenting character components on character-containing documents involving first scanning a document and quantizing the image information obtained by the scanning into two levels, e.g., black and white, by 1 and 0 bits, and from the quantized information, m-bit OR groups are generated by sequentially ORing every m-th bit in a first direction of the quantized image, where m is an integer equal to or greater than two. The black (character) bits in each of the m-bit OR groups are counted and processed using the steps of: sequentially calculating sums of n consecutive count values by shifting one by one the count values obtained by the counting along a second direction perpendicular to the first direction; and then, segmenting character components by comparing the sums with a predetermined threshold value. The ORing operations can be performed conveniently by employing the OR instruction provided in a typical microprocessor and can attain substantially the same accuracy as conventional OCR systems employing an m.times.n mask.

REFERENCES:
patent: 3432673 (1969-03-01), Mader
patent: 3543238 (1970-11-01), Schade
patent: 3629826 (1971-12-01), Cutaia
patent: 4377803 (1983-03-01), Lotspiech et al.
patent: 4466121 (1984-08-01), Damen et al.
patent: 4527283 (1985-07-01), Ito et al.
Kim, "Baseline Drift Correction of Handwritten Test", IBM Tech. Disc. Bulletin, vol. 25, No. 10, Mar. 1983, pp. 5111-5114.

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