Video monitor contrast reference gray scale apparatus and method

Details Video monitor contrast reference gray scale apparatus and method Video monitor contrast reference gray scale apparatus and method

1994-04-14

1996-04-30

Kostak, Victor R.

Television

Display or receiver with built-in test signal generator,...

348254, 348334, 348671, H04N 1700

Patent

active

055129439

ABSTRACT:
A video monitor contrast reference gray scale apparatus, and method of use thereof, wherein the apparatus comprises a reference gray scale housing, a reference gray scale which comprises a plurality of fields which provide a contrast range on the reference gray scale, a light source which is located inside the reference gray scale housing and which provides illumination to the reference gray scale, and a power supply for providing power to the light source. The reference gray scale is located in the reference gray scale housing, and further, the power supply provides power to the light source so as to provide illumination of the reference gray scale. A method for utilizing the apparatus for matching a contrast range of a camera video assist with a contrast range of a film camera negative. A method for matching a contrast range of a reference gray scale with a contrast range of a film camera negative, in conjunction with an adjustable contrast filter device and/or a camera viewfinder ocular.

REFERENCES:
patent: 4101928 (1978-06-01), Sato et al.
patent: 4345271 (1982-08-01), Sekiguchi
patent: 4568975 (1986-02-01), Harshbarger
patent: 4730214 (1988-03-01), Lambert et al.
patent: 4939581 (1990-06-01), Shalit
patent: 5033015 (1991-06-01), Zwirn

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