Automatic handwritten and typewritten character-reading device

Details Automatic handwritten and typewritten character-reading device Automatic handwritten and typewritten character-reading device

1981-11-09

1984-07-17

Martin, John C.

Image analysis

Histogram processing

For setting a threshold

382 54, 382 55, G06K 946, G06K 940, G06K 944

Patent

active

044610297

ABSTRACT:
This disclosure concerns a system for automatically reading handwritten and typewritten characters. First, a 64.times.64 point image is made of each character. Then the size and any overlapping with an adjacent character is considered in determining whether the character is either handwritten or typewritten, the latter being smaller and not overlapping. To consider these properties, the image on the 64.times.64 point image area is moved into the upper lefthand corner of the area so that its top and lefthand edge of the image are in contact with the top and lefthand edge of the area for better determining the size of the image after overlapping, if any, has been eliminated. Next, each of the images on the 64.times.64 point image areas, is separated into four images having 32.times.32 image points which are stored in four separate registers. The four 32.times.32 point images correspond with each of the four points making up each square of four image points of the original 64.times.64 point image, which squares of four image points are homogeneously distributed over the total 64.times.64 point image area. By selecting successively or simultaneously the corresponding image points stored in one or more of these 32.times.32 point image stores or registers, each character can be enhanced, enlarged, sharpened, or widened so as to be better readable. The final detection of the character is made by comparison with separate learning means for the clasified typewritten and handwritten characters.

REFERENCES:
patent: 3694807 (1972-09-01), Bond et al.
patent: 3781801 (1973-12-01), Anderegg
patent: 3810094 (1974-05-01), Mori et al.
patent: 3832682 (1974-08-01), Brok et al.
patent: 3895350 (1975-07-01), DeVries
patent: 3930228 (1975-12-01), Spanjersberg
patent: 3999161 (1976-12-01), Bilzem et al.
patent: 4162482 (1979-07-01), Su
IBM Technical Disclosure Bulletin, vol. 15, No. 11, Apr. 1973.
IBM Technical Disclosure Bulletin, vol. 22, No. 10, Mar. 1980.
Proceedings of the Second International Joint Conference on Pattern Recognition of Aug. 13-15, 1974.

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