Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-06-07
1985-06-11
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 28, 358 30, H04N 9535
Patent
active
045232210
ABSTRACT:
A color TV receiver designed to digitally process I and Q color mixture signals incorporates chroma gain control, static tint control and autoflesh in the circuitry for converting the I and Q signals to (R-Y), (B-Y) and (G-Y) for R,G,B matrixing. The magnitude and angle of the vector sum of I and Q are first determined. The angles are then adjusted for static tint control and then applied to a ROM which is programmed to output angles adjusted for fleshtones. Angles from the autoflesh ROM are applied to a summing circuit which algebraically adds to the flesh corrected angle, angle values corresponding to the angular displacement between the I axes and the (R-Y), (B-Y) and (G-Y) axes. The angles produced by the summing circuit are applied to a look-up ROM which produces the cosine values of the applied angles.
The magnitude signal is amplified by coefficients which relate the I and Q signals to (R-Y), (B-Y) and (G-Y) components and which coefficients may be amplified by a chroma gain signal. The amplified magnitude signal is thereafter multiplied by the cosine values which effectively projects the vector sum or chrominance signal onto the respective (R-Y), (B-Y) and (G-Y) axes to generate instantaneous (R-Y), (B-Y) and (G-Y) signal samples.
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Batterman Eric P.
Bolger Thomas V.
Chin Danny
Herrmann E. P.
Rasmussen P. J.
RCA Corporation
Shepperd John W.
Whitacre E. M.
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