Optical wand for mechanical character recognition

Details Optical wand for mechanical character recognition Optical wand for mechanical character recognition

1979-04-20

1981-01-20

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401463H, G06K 922

Patent

active

042465702

ABSTRACT:
An optical wand for automatically recognizing characters in a plurality of fonts incorporates a manually movable scanner incorporating a light source and a sensor array composed of a diode matrix. A first preprocessing unit is connected to receive the output from the scanner, and includes a correlation unit for buffering the data and apparatus for eliminating the effect of different characteristics of the individual photo diodes. The first preprocessing unit also includes a row tracking circuit and a segmentation circuit for presegmenting and for centering the character. Further segmentation, and filtering of the image is carried out by a second preprocessing unit which is decoupled from the first preprocessing unit, so that its operation is concurrent with that of the scanner. A recognition unit, decoupled from the second preprocessing unit, is connected thereto, and establishes individual values for the scanned characters by use of a quadratic polynomial classifier.

REFERENCES:
patent: 3947817 (1976-03-01), Requa
patent: 3964022 (1976-06-01), Martin
patent: 4056804 (1977-11-01), Whitfield et al.
patent: 4088981 (1978-05-01), Gott
patent: 4104616 (1978-08-01), Isshiki et al.
patent: 4115703 (1978-09-01), Dobras
patent: 4118687 (1978-10-01), McWaters et al.
patent: 4158194 (1979-06-01), McWaters et al.
Chow, "An Optimum Character Rec. System . . . ", IRE Trans on Electronic Computers, vol. EC-6, No. 1, Mar. 1957, pp. 247-254.

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