Method and device for independent color management
View Patent ↗The present invention discloses a method and a device for independent color management by using a look-up table (LUT) so as to adjust the color saturation of a single color independently. The method comprises steps of: receiving a color signal of an input pixel; determining color flags and initial saturation values from the color signal by using a look-up table (LUT); obtaining user-controlled color gains according to the color flags; multiplying each of the initial saturation values with one of the corresponding user controlled color gains so as to output an adjusted saturation value; determining a final gain from each the adjusted saturation value by bilinear interpolation according lower-bits of the color signal; and obtaining a new color signal according to the final gain and the color signal. The device comprises a look-up table circuit, defining color flags and initial saturation values as a plurality of points on a coordinate system and receiving a color signal as to output a plurality of signals; a gain output device, receiving the color flags, the initial saturation values and user controlled color gains as to output adjusted saturation gain signals according to the initial saturation values and the user controlled color gains; and an operation unit, receiving the color signal, the initial gain signals as to adjust the color signal according to lower bits of the color signal and the adjusted saturation gain signals.
1. A method for independent color management, comprising steps of:
receiving a color signal of an input pixel;
determining color flags and initial saturation values from said color signal by using a look-up table (LUT);
obtaining user-controlled color gains according to said color flags;
multiplying each of said initial saturation values with one of said corresponding user controlled color gains so as to output an adjusted saturation value;
determining a final gain from each said adjusted saturation value by bilinear interpolation according to lower-bits of said color signal; and
obtaining a new color signal according to said final gain and said color signal.
2. The method for independent color management as recited in claim 1 , wherein said final gain S is expressed as
S =( S 1 ×A 4 +S 2 ×A 3 +S 3 ×A 2 +S 4 ×A 1)/( A 1 +A 2 +A 3 +A 4)
where S 1 , S 2 , S 3 and S 4 denote said values corresponding to said initial saturation values and A 1 , A 2 , A 3 and A 4 are determined from said lower bits of said color signal.
3. The method for independent color management as recited in claim 1 , wherein said color signal is a pair of (Cb, Cr) values or (U, V) values.
4. The method for independent color management as recited in claim 1 , wherein said new color signal is a new pair of (Cb, Cr) values or (U, V) values.
5. A device for independent color management, comprising:
a look-up table circuit, defining color flags and initial saturation values as a plurality of points on a coordinate system and receiving a color signal so as to output a plurality of signals;
a gain output device, receiving said color flags, said initial saturation values and user controlled color gains so as to output adjusted saturation gain signals according to said initial saturation values and said user controlled color gains; and
an operation unit, receiving said color signal, said adjusted saturation gain signals so as to adjust said color signal according to lower bits of said color signal and said adjusted saturation gain signals.
6. The device for independent color management as recited in claim 5 , wherein said gain output device further comprises:
a controlled gain multiplexer, receiving said user controlled color gains and said color flags so as to output a plurality of corresponding color gains corresponding to a plurality of saturation signals; and
a plurality of multipliers, the number of said multipliers corresponding to the number of said color signals, wherein said multipliers receive in a one-on-one fashion said saturation signals and said corresponding color gains so as to output said adjusted saturation gain signals.
7. The device for independent color management as recited in claim 5 , wherein said operation unit further comprises:
a bi-linear interpolation device, receiving said adjusted saturation gain signals and said the lower bits of said color signal so as to output a final gain signal; and
two multipliers, receiving said color signal and said final gain signal so as to output said adjusted color signal.