Patent ID: 7031516

Claim:
An edge achromatization circuit, comprising: luminance signal conversion means for converting first color signals inputted from an input terminal group before γ correction processing into a luminance signal; first subtraction means for arithmetically operating the luminance signal and the first color signals to obtain color difference signals; edge detection means for detecting an edge signal from the luminance signal; absolute value operation means for converting the edge signal into an absolute value; first multiplication means for multiplying the absolute from said absolute value operation means and a first coefficient signal inputted thereto from said input terminal group to control the gain of the value; level limit means for obtaining a second output coefficient from the value of the controlled gain and a limit level setting signal inputted thereto from said input terminal group; second multiplication means for multiplying the second output coefficient and the color difference signals outputted from said first subtraction means; and second subtraction means for arithmetically operating results of the multiplication by said second multiplication means and the first color signals to obtain second color signals to be outputted from said edge achromatization circuit.