Patent ID: 8446496

Claim:
A knee correction device comprising: a generator configured to generate a luminance signal from R, G, and B color signals; a detector configured to detect a color signal having a maximum value among the R, G, and B color signals; a mixer configured to mix the luminance signal generated by the generator and the color signal detected by the detector, at a predetermined mixing ratio; a first supply module configured to supply, for an output of the mixer, a first coefficient for controlling a chroma amount for each of the R, G, and B color signals, based on a first input/output characteristic with a negative inclination; a first calculator configured to perform level compression on the R, G, and B color signals by subjecting the first coefficient supplied by the first supply module and each of the R, G, and B color signals to a calculation; a second supply module configured to supply, for the output of the mixer, a second coefficient for controlling a luminance level for each of the R, G, and B color signals, based on a second input/output characteristic with a positive inclination; and a second calculator configured to perform level control on the R, G, B color signals by subjecting the second coefficient supplied by the second supply module and each of output signals of the first calculator to a calculation.