Scanner and calibration method used therein

Details Scanner and calibration method used therein Scanner and calibration method used therein

2006-06-06

2006-06-06

Livedalen, Brian J. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C358S406000

Reexamination Certificate

active

07057195

ABSTRACT:
A scanner and calibration method use therein. Setting first exposure duration and a second exposure duration for a transparency, wherein the first exposure duration is proportional to the second exposure duration. Scanning the transparency and a calibration area to produce a scan signal and a calibration signal, respectively, wherein the exposure duration for scanning the transparency is referred to as the first exposure duration, and the exposure duration for scanning the calibration area is referred to as the second exposure duration. Calculating a first gain coefficient according to the calibration signal. Calculating a second gain coefficient according to the first gain coefficient and a specific ratio of the first exposure duration to the second exposure duration, and finally, amplifying the scan signal by the second gain coefficient.

REFERENCES:
patent: 5563723 (1996-10-01), Beaulieu et al.
patent: 2004/0165091 (2004-08-01), Takemura et al.

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