Video image enhancer

Details Video image enhancer Video image enhancer

1985-02-11

1989-01-10

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358164, H04N 557, H04N 514, H04N 5202

Patent

active

047977450

ABSTRACT:
A video image enhancer is disclosed for use in surveillance at low light levels to enhance dark and/or low contrast segments of a composite video signal of a surveyed scene by subjecting the dark and/or low contrast segments thereof to high gain and bright and/or high contrast segments to low gain. The video image enhancer includes an input designed to receive the composite video signal, a device provided with a dc restorer circuit and a variable potentiometer to yield an adjustable-bias dc clamp of the composite video signal, a second variable potentiometer for adjusting the high-gain slope of the device, a diode clamp connected to the device's output, and a pair of drivers coupled to the device's output to provide a low impedance output video signal with its dark and/or low contrast segments enhanced. Preferably, the device is a non-inverting operational amplifier. Preferably, the pair of drivers comprise a pair of NPN transistors connected in an emitter-base configuration.

REFERENCES:
patent: 2876349 (1959-03-01), Rogers
patent: 3633044 (1972-01-01), Buckstad
patent: 4366440 (1982-12-01), Olson et al.
patent: 4503464 (1985-03-01), Dielhof
Freeman et al., "Variable Gamma Corrector Improves Television Video Signals," Electronic Engineering, Sep. '70, pp. 90-93.

Affiliated with

Also associated with

Rating

Video image enhancer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video image enhancer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video image enhancer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2111180