VIDEO IMAGE ENHANCER
Assignee
BAIRD CORPORATION
Filed
Feb 11, 1985
Granted
Jan 10, 1989
Location
WESTON MA US
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jan 10, 1986
Rescinded
Apr 1, 1988
Duration
2 years, 2 months
Inventor
- 1WILLIAM E. WESTELL
Record Details
- Patent number
- US 4797745
- Application
- 00670062
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records