Optical character reader with skew recognition

Details Optical character reader with skew recognition Optical character reader with skew recognition

1989-02-13

1990-07-10

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 37, 382 48, G06K 932

Patent

active

049411896

ABSTRACT:
An optical character reader (OCR) using parallel state machines is provided wherein each state machine identifies a different character. Program tables for each of the state machines compare received bit strings of scanned data and compare them to positive and negative reference patterns in the state machines, wherein the positive reference patterns are tested for in sequence with advancement of test the next positive reference pattern only if the present positive reference pattern being tested for is present, and if none of at least one negative reference pattern is present. The OCR also detects and corrects skew by mathematically projecting a shadow of each character on the right margin of the page for each of a plurality of small incremental rotation angles for the characters. The rotation angle producing the sharpest and narrowest shadow effect is determined to the angle at which the characters are skewed.

REFERENCES:
patent: 4398177 (1983-08-01), Bernhardt
patent: 4453268 (1984-06-01), Britt
patent: 4723297 (1988-02-01), Postl

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