Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-01-17
2006-01-17
Nguyen, Madeleine (Department: 2626)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S520000, C348S649000
Reexamination Certificate
active
06987583
ABSTRACT:
A color television receiver system processes color difference signals for providing tint control while maintaining uniform color amplitude with respect to changes in hue shift angle. The color difference signals are modified as a function of each other and as a function of a hue shift angle to produce modified color difference signals. A color difference signal [B-Y] is supplied as a first input to multipliers M1and M3. Another color difference signal [R-Y] is supplied as a first input to another pair of multipliers M2and M4. A control signal generator produces output signals sin θ and cos θ where θ is the hue shift angle. The sin θ signal is supplied as a second input to multipliers M1and M4while the cos θ signal is supplied as a second input to multipliers M2and M3. The outputs of M1and M2are added in an adder A1to produce a modified output [R-Y]′. Similarly, the output of multiplier M3is provided as a positive input to adder A2whereas the output of multiplier M4is provided as a negative input to adder A2to produce a modified color difference signal [B-Y]′. The modified color difference signals [R-Y]′ and [B-Y]′ represent a color vector having an amplitude A that remains substantially constant over a relatively wide range of hue shift angles θ.
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Altmanshofer Robert Dale
Lagoni William Adamson
Lagoni William A.
Nguyen Madeleine
Shedd Robert D.
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