Color image processing apparatus and method for color enhancement

An apparatus for enhancing pixel color having three components (R, G, B) respectively corresponding to the primary colors of Red, Green and Blue, comprising:

• a first circuitry for determining and outputting a reference value X;
• a second circuitry for subtracting X from three components (R, G, B) respectively to obtain values of (R−X), (G−X) and (B−X);
• a third circuitry for scaling said values of (R−X), (G−X) and (B−X) by a factor S to generate values of S*(R−X), S*(G−X) and S*(B−X);
• and
• a fourth circuitry for respectively adding said values of S*(R−X), S*(G−X) and S*(B−X) to said three components (R, G, B) to generate three enhanced components.

An apparatus for enhancing pixel color having three components (R, G, B) respectively corresponding to the primary colors of Red, Green and Blue, comprising:

• a first circuitry for respectively calculating and outputting values of (R−G), (G−B) and (B−R);
• a first multiplexer circuitry, coupled to the first circuitry and responsive to a first selection signal, for selectively outputting two values of (R−G), (G−B) and (B−R) according to a first predetermined manner;
• a multiplier circuitry, coupled to the first multiplexer circuitry, for selectively generating two scaled values of S*(R−G), S*(G−B) and S*(B−R), wherein S is a predetermined scale factor;
• a second multiplexer circuitry, coupled to the multiplier circuitry and responsive to a second selection signal, for selectively outputting the S*(R−G), S*(G−B) and S*(B−R);
• an AND logic circuitry, coupled to the second multiplexer circuitry and responsive to a first control signal, for selectively outputting a set signal of (S*(B−R), S*(G−B), 0), (S*(R−G), 0, S*(G−B)) and (0, S*(R−G), S*(B−R));
• and
• an arithmetic circuitry, coupled to the AND logic circuitry and inputting the three components (R, G, B), for selectively outputting an enhanced color components of (R+S*(R−B), G+S*(G−B), B), (R+S*(R−G), G, B+S*(B−G)) and (R, G+S*(G−R), B+S*(B−R)), responsive to a second control signal.