Character recognition apparatus

Details Character recognition apparatus Character recognition apparatus

1989-03-09

1991-03-05

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 18, 382 16, G06K 900

Patent

active

049982850

ABSTRACT:
Each row of characters is extracted from document data representing rows of characters by a character row extracting circuit. The characters are separated from the row by a character separating circuit. In a reference line detecting circuit two histograms are formed, one pertaining to the upper sides of the rectangles bordering the extremities of the characters, and the other pertaining to the lower sides of these rectangles. Two reference lines are defined from the histogram. The characters are sorted intoseveral categories, in accordance with their sizes and the positions they take with respect to the reference lines. The pattern of each character is compared with the dictionary patterns of the same category.

REFERENCES:
patent: 4251799 (1981-02-01), Jih
patent: 4481665 (1984-11-01), Ota
patent: 4528692 (1985-07-01), Umeda et al.
patent: 4558461 (1985-12-01), Schlang
patent: 4562594 (1985-12-01), Bednar et al.
patent: 4594732 (1986-06-01), Tsuji
8th International Conference on Pattern Recognition, vol. 2, pp. 1218-1220, "The Use of Global Context in Text Recognition"; Jonathan J. Hull; Oct. 27-31, 1986.

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