Optical character recognition

Details Optical character recognition Optical character recognition

1980-05-14

1982-07-13

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

235454, 250566, 3401463AG, G06K 928

Patent

active

043397450

ABSTRACT:
High contrast image data is acquired from metal and other hard surfaces with varying roughness and reflectivity on which characters are impressed by vibrapeening or laser marking. The optical scanner applies normal illumination and a linear photodiode array detects light reflected normal to the surface and within a narrow acceptance angle, so that characters appear dark and the background light. The detector signal is preprocessed to remove nonuniform background variations and yield image data which can be fed to conventional character recognition equipment.

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Penny, "Dynamic Threshold Setting Circuit", IBM Tech. Disclosure Bulletin, vol. 18, No. 6, Nov., 1975, pp. 1962-1965.
Dorr et al., "Thresholding Method for a Mark Reading System", IBM Tech. Disclosure Bulletin, vol. 15, No. 8, Jan., 1973, pp. 2595-2596.

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