Method for determining an adjustment amount to an input chroma

Details Method for determining an adjustment amount to an input chroma Method for determining an adjustment amount to an input chroma

2007-03-27

2007-03-27

Ometz, David (Department: 2622)

Television

Image signal processing circuitry specific to television

Hue control

C348S603000, C348S650000, C348S708000

Reexamination Certificate

active

10642796

ABSTRACT:
A method is disclosed for determining an adjustment amount to be made to an input chroma, Cin, to squeeze the input chroma toward a region of preferred chroma, Cpref. This method involving first defining a change in chroma as: ΔC=Cin−Cprefand defining a chroma weight as: Cweight=Gaussian(Cpref,Csigma); defining a luminance weight as: Lweight=Gaussian(Lpref,Lsigma); defining a hue weight as: Hweight=Gaussian(Hpref,Hsigma);. Then, an amount of chroma adjustment is: CAdjust=ΔC*(Hweight*Cweight*Lweight). An output chroma is generated by applying chroma adjustment to chroma input: Cout=Cin−CAdjust.

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Article by Karin Töpfer and Robert Cookingham of the Eastmak Kodak Company in Rochester, NY, entitled: “The Quantitative Aspects of Color Rendering for Emmory Colors” from the IS&T's 2000 PICS Conference.

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