Calibrated color scanner

Details Calibrated color scanner Calibrated color scanner

1990-08-13

1995-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358496, H01J 314

Patent

active

054245370

ABSTRACT:
A rotary color scanner has both linear and logarithmic mode static and dynamic calibration to quickly and automatically calibrate the scanner before each scan, as well as during a given scan, without operator intervention of any kind, whether in the factory or in the field. Close calibration is achieved, despite the use of photomultiplier detectors which are inherently particularly susceptible to drift, and despite the use of high intensity lamps whose output typically varies greatly with aging. The system establishes operation at an optimized data throughput rate up to a limit determined by the maximum scan rate of the system, and thereafter switches to operation at an optimized signal
oise ratio.

REFERENCES:
patent: 3914538 (1975-10-01), Perreault et al.
patent: 4694156 (1987-09-01), Swanberg

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