Optical character reader with tangent detection for detecting ti

Details Optical character reader with tangent detection for detecting ti Optical character reader with tangent detection for detecting ti

1996-09-27

1999-11-09

Kelley, Christopher S.

Image analysis

Image transformation or preprocessing

Measuring image properties

382181, 382185, 382190, 382290, 382321, 348193, 348194, 348358, 348453, G06K 936

Patent

active

059829524

ABSTRACT:
A character reader comprises an input unit for reading characters by a scanner-typed photoelectric transfer unit as an image, creating the image data formed by binary pixel of white and black lying on the plain surface and entering the same, a tangent detecting unit for detecting tangent information on tangents contacting with black pixels forming a character string within the image data, a tilt deciding unit for deciding a representative tangent which is representative for the direction of a row of character string, from the above-mentioned tangents, on the basis of the tangent information detected by the tangent detecting unit.

REFERENCES:
patent: 4558461 (1985-12-01), Schlang
patent: 5020117 (1991-05-01), Oai et al.
patent: 5031225 (1991-07-01), Tachikawa et al.
patent: 5058182 (1991-10-01), Kuan et al.
patent: 5633954 (1997-05-01), Gupta et al.
patent: 5638462 (1997-06-01), Shirakawa
"Document Image Structural Analysis by Split Detecting Methods", p. 491-198, vol. 4, 1991, Institute of Electronics, Information and Communications Engineers.
M. Hamanaka, et al., "Normalization-cooperated Feature Extraction Method for Handprinted Kanji Character Recognition", Pattern Recognition Res. Lab., pp. 1, 3, 5, 1993.

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