Method and apparatus for compensating illuminance error of a lig

Details Method and apparatus for compensating illuminance error of a lig Method and apparatus for compensating illuminance error of a lig

1996-12-23

1998-10-13

Font, Frank G.

Optics: measuring and testing

Photometers

Comparison

2502081, 250205, 358406, 358504, 358475, G02B 2308, G02B 2722, G02B 700, G91J 110

Patent

active

058220526

ABSTRACT:
A method and an apparatus for compensating illuminance error of a light source is adapted to be used in a transmission type scanner and utilizes the light signal directly transmitted from the light source to an image pickup device of the scanner without passing through any scanned object as an illuminance calibration reference to compensating illuminance error of the light source. The calibration light signal can be transmitted from the light source to the image pickup device through a light transmission region arranged beside a scanning region.

REFERENCES:
patent: 4680644 (1987-07-01), Shirato et al.
patent: 5212376 (1993-05-01), Liang
patent: 5278674 (1994-01-01), Webb et al.
patent: 5285293 (1994-02-01), Webb et al.
patent: 5592306 (1997-01-01), Cheng
patent: 5636040 (1997-06-01), Tung

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