Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-10-31
1996-10-15
Metjahic, Safet
Television
Image signal processing circuitry specific to television
Gray scale transformation
348660, 348254, H04N 969
Patent
active
055659314
ABSTRACT:
A system and method for generating gamma-predistorted video signals. A close approximation to the ideal gamma predistorted values of Y, Cr and Cb video signal components are generated from linear camera or computer output signals using at most a single matrix multiplication, one channel of inverse gamma function generation (on the luminance component) and two table look up operations. The linear luminance value is predistorted by an inverse gamma function. If they are not available from the video source, a matrix multiplication is used to generate linear luminance and chrominance signals. The linear chrominance signals are then adjusted for their dependence on luminance using a two-dimensional table look-up. The lookup table(s) is (are) addressed by the linear luminance value and by each of the linear chrominance values to produce gamma-predistorted Cr and Cb signals from the tables.
REFERENCES:
patent: 4751566 (1988-06-01), Pilot
patent: 4999702 (1991-03-01), Knierim
A. Netravali and B. Haskell, Digital Pictures, Plenum Press, New York, 1988.
International Telecommunication Union--Radiocommunication Study Groups--Draft Revision of Recommendation ITU-R BT, 601-4 "Studio Encoding Parameters of Digital Television for Standard 4.3 and Wide-Screen 16:9 Aspect Ratios", 24 Oct. 1994, pp. 1-24.
Hsia Sherrie
Metjahic Safet
Vivo Software. Inc.
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