Contour emphasizing circuit

A contour emphasizing circuit comprising an A/D conversion circuit for converting input analog color video signals to output digital color video signals, a signal processing circuit for receiving the output digital color video signals and producing processed digital color video signals, a Y signal generation circuit for generating a Y signal from the output digital color video signals, a contour extracting circuit for extracting contour components from the Y signal, contour adders for adding the contour components to the processed digital color video signals and a contour emphasizing enabling circuit for controlling when the extracted contour components are supplied to the contour adders, wherein the contour emphasizing enabling circuit comprises an enabling signal generation circuit for generating a contour emphasizing enabling signal based on a display area signal, an output control circuit for controlling whether the enabling signal is output to allow contour emphasis to take place and a contour addition control circuit provided between the contour extracting circuit and the contour adders for controlling whether or not the extracted contour components are supplied to said contour adders based on the enabling signal, the enabling signal generation circuit comprising a vertical enabling signal generation circuit for generating a vertical contour emphasizing enabling signal based on a vertical display area signal, a horizontal enabling signal generation circuit for generating a horizontal contour emphasizing enabling signal based on a horizontal display area signal and an AND circuit for generating contour emphasizing enabling signals from AND signals of the vertical and horizontal contour emphasizing enabling signals generated by said vertical and horizontal enabling signal generation circuits.