Optical scanner using weighted adaptive threshold

Details Optical scanner using weighted adaptive threshold Optical scanner using weighted adaptive threshold

1997-07-15

1999-11-23

Gross, Anita Pellman

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Coded record sensors

Particular sensor structure

23546225, 358456, G06K 958

Patent

active

059885041

ABSTRACT:
An optical scanner having a weighted adaptive threshold value determination for generating a one-bit representation of a scanned original. The optical scanner comprises an optical detecting unit which provides a discrete signal representing pixels in a scanned region and first device for generating a first weighted discrete signal which is a weighted version of the discrete signal representing pixels in a scanned region. The optical scanner further comprises second device for providing a filtered signal which is a filtered version of the weighted discrete signal and third device for generating a second weighted signal, being a weighted version of the filtered signal. A comparison device produces a binary output as a function of the discrete signal representing pixels in a scanned region and the second weighted signal.

REFERENCES:
patent: 4345314 (1982-08-01), Melamud et al.
patent: 5377020 (1994-12-01), Smitt

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