Patent ID: 6437792
Filing Date: 2002-08-20
Classification: G09G,H04N

Abstract:
An image processor adapted to convert, for outputting, an image from a predetermined input device to an image corresponding to the color gamut of a corresponding output device, the image processor comprising:means for reducing, when the output device color gamut is different from the color gamut of the input device, the color gamut of a color signal outside the output device color gamut in the direction of a minimum value of the color difference formula given by the following equation (1) or (2): Î”&it;â€ƒ&it;E={[Î”&it;â€ƒ&it;L*&it;â€ƒ&it;Î”&it;â€ƒ&it;C*&it;â€ƒ&it;Î”&it;â€ƒ&it;H*&it;]&af;[KllK1cKlhKclKccKchKhlKhcKhh]&af;[Î”&it;â€ƒ&it;L*Î”&it;â€ƒ&it;C*Î”&it;â€ƒ&it;H*]}1/2(1)Î”&it;â€ƒ&it;E=(Î”&it;â€ƒ&it;L*Kl)2+(Î”&it;â€ƒ&it;C*Kc)2+(Î”&it;â€ƒ&it;H*Kh)2+(Î”&it;â€ƒ&it;L*&CenterDot;Î”&it;â€ƒ&it;C*Klc)+(Î”&it;â€ƒ&it;C*&CenterDot;Î”&it;â€ƒ&it;H*Kch)+(Î”&it;â€ƒ&it;H*&CenterDot;Î”&it;â€ƒ&it;L*Khl)(2)where &Dgr;L* is a difference in lightness; &Dgr;C* is a difference in chroma; &Dgr;H* is a difference in hue; and Kl, Kc, Kh, Kll, Klc, Klh, Kcl, Kcc, Kch, Khl, Khc and Khh are predetermined constants, respectively, or functions of a lightness L*, chroma C* and hue h*, respectively.