Optical character reader

Details Optical character reader Optical character reader

1998-01-20

2000-11-07

Frech, Karl D.

Registers

Coded record sensors

Particular sensor structure

235455, G06K 714

Patent

active

061423742

ABSTRACT:
An optical character reader is provided for detecting frame lines of a character entry frame printed on a medium in which a character is written. The optical character reader includes a scanner, a frame width determining circuit, and a frame line equation defining circuit. The scanner scans the medium to produce a bit-mapped image of the medium including a character entry frame image represented with black pixels. The frame width determining circuit determines a width of the frame lines of the character entry frame based on a histogram of the number of black pixels continuously arranged over one of the frame lines in a direction perpendicular to the length of the frame lines. The frame line equation defining circuit defines line equations representing side boundaries of each of the frame lines according to a least squares method using set of pixels arranged on sides of each of the frame lines over the width of the frame lines to determine locations of the frame lines on the bit-mapped images. The character entry frame image is removed from the bit-mapped image to extract only a character image with high quality.

REFERENCES:
patent: 5907630 (1999-05-01), Naoi et al.

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