Optical character recognition illumination method and system

Details Optical character recognition illumination method and system Optical character recognition illumination method and system

1992-12-31

1996-05-07

Boudreau, Leo

Image analysis

Applications

Manufacturing or product inspection

382145, G06K 900

Patent

active

055154522

ABSTRACT:
An improved illumination method and apparatus for optical character recognition. A first light source is positioned such that light emitted from it strikes the surface at an angle of incidence. A detector is placed at the angle of reflection, such that specularly reflected light strikes the detector, providing bright field illumination. Additional light sources positioned at angles different from the first light source are disclosed to provide for high and low angle dark field illumination. Novel light guides which allow for a compact and economic system design are also disclosed. The disclosed system utilizes light sources and filters which greatly reduce the effect of environmental lighting on the optical character recognition process. A novel method to select the optimum light source and intensity is also disclosed.

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