GAMMA COMPENSATION APPARATUS

摘要

Aiming to improve color reproducibility of a red part having high color saturation, a gamma compensation apparatus of the present invention is composed of a bending point setting block (100a) and a gamma compensation block (101a) and bending point setting block (100a) is composed of a high APL detection circuit (1a) inputting an average picture level of an input luminance signal and for detecting and taking out a signal component higher than a designated level; a gain controller (2a) for gain controlling the detected signal at the high APL picture detection circuit; and an adder (3a) for adding a designated offset to the output of gain controller (2a), and gamma compensation block (101a) is composed of a slice circuit (4a) inputting a color difference signal (R-Y) and the output of bending point setting block (100a) and taking out a color difference signal component higher than the output signal level of bending point setting block (100a); a gain controller (5a) for adjusting the output level of slice circuit (4a); and a subtracter (6a) for subtracting the output of gain controller (5a) from the input color difference signal (R-Y) and outputting a gamma compensated color difference signal (R-Y)'.