Hue correction circuit for a digital TV receiver

Details Hue correction circuit for a digital TV receiver Hue correction circuit for a digital TV receiver

1983-11-21

1985-12-10

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, H04N 9535

Patent

active

045583510

ABSTRACT:
A digital hue correction circuit for correcting the color of digital TV chrominance signals includes a pipelined divider arranged to divide the smaller of the magnitudes of I and Q color mixture signals by the larger of the magnitudes of the I and Q signals to produce quotients representing tangents over the range of zero to 45 degrees for chrominance angles occurring over the range of zero to 360 degrees. The polarity bits of the I and Q signals and the polarity bit of the difference of the magnitudes of I-Q are encoded to transpose the zero to 45 degree angle tangent values over the range of zero to 360 degree angles. The transposed tangent values address a memory programmed with all negative hue correction coefficients representing the sines and cosines of angles by which the chrominance vector is to be rotated to effect hue correction. The I and Q signals and the hue correction coefficients are applied to a complex multiplier to produce corrected I and Q color mixture signals I' and Q' according to the equations

REFERENCES:
Ser. No. 487,084, filed 4/21/83 "Auto Flesh Circuitry as for a Digital TV Receiver", Kao (RCA 79,481).
Ser. No. 501,896, filed 6/7/83 "An Auto Tint Circuit for a TV Receiver", Chin (RCA 79,489).
Ser. No. 487,082, filed 4/21/83 "Manual Hue Control as for a Digital TV", Harwood (RCA 77,627).

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