Digital gamma correction system for low, medium and high intensi

Details Digital gamma correction system for low, medium and high intensi Digital gamma correction system for low, medium and high intensi

1994-06-07

1995-12-05

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348674, H04N 5202

Patent

active

054733731

ABSTRACT:
An image capture and display system contains a three-stage digital gamma correction circuit. Three equations are used to determine the gamma correction characteristics for low intensity, medium intensity, and high intensity signal levels, respectively. Linear correction is used for low and high intensity levels, and an adjustable non-linear correction is used for medium levels. The resultant effects of the combined correction characteristics are to increase the effective Signal-to-Noise ratio for low level signals, enhance the gray level differentiation for high level signals, and heighten the contrast control for medium level signals. In addition, the contrast control is effective throughout the entire range of signal intensity levels. The image capture and display system provides a high quality visual display, with a simple, economical hardware implementation of the inventive gamma correction circuit. The resultant small size and low cost of the inventive circuit make it particularly advantageous for camcorders, still cameras, handy scanners, and other image capture devices.

REFERENCES:
patent: 5243426 (1993-09-01), Murayama

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