Shading correction system for use with an optical scanner

Details Shading correction system for use with an optical scanner Shading correction system for use with an optical scanner

1990-04-26

1991-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502083, H01J 4014

Patent

active

050361864

ABSTRACT:
An improved shading correction system is disclosed where the light intensity variations of the light sources are sensed and are fed back to the shading correction system for improved shading correction. Such feedback action may be applied both during the recording of shading profile reference values when a reference target is scanned and for shading correction when the actual target is scanned.

REFERENCES:
patent: 4150402 (1979-04-01), Tietz et al.
patent: 4539478 (1985-09-01), Sano
patent: 4673811 (1987-06-01), Looschen
patent: 4757191 (1988-07-01), Shimada et al.

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