Edge effect compensating bar code reader

Details Edge effect compensating bar code reader Edge effect compensating bar code reader

1997-06-27

2000-09-12

Assouad, Patrick

Data processing: measuring, calibrating, or testing

Calibration or correction system

2504731, 2504831, 2504921, 382173, 382190, 235375, 235462, 235468, G06T 100, G06T 760, H03M 110

Patent

active

061190713

ABSTRACT:
Apparatus and method for reading a luminescent bar code on a background surface whose reflectance may vary over the coded area, including a light source for providing light to scan, and to excite luminescence in the bar code or to reflect from the background surface of the coded area; a first detector responsive to reflected non-luminescent light for providing a first signal; a second detector responsive to luminescent light for providing a second signal; and memory having stored calibration indicia of reflectance and luminescence, the memory responsive to the first and second signals for providing an output signal substantially independent of background reflectance, and substantially free of bar code edge distortion.

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