Patent ID: 6359659
Filing Date: 2002-03-19
Classification: H04N

Abstract:
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 and contour adders for adding contour components to the processed digital color video signals and produce contour-emphasized digital color video signals, wherein the contour extracting circuit comprises first and second line memories connected in series for delaying the Y signal generated by the Y signal generation circuit, a vertical contour extracting circuit for extracting a vertical contour component on the basis of the Y signal generated from the Y signal generation circuit, a Y signal from the first line memory and a Y signal from the second line memory, a contour emphasizing frequency setting circuit comprising n 1-dot delay elements connected in series for generating two kinds of delayed Y signals consisting of an n-dot delayed Y signal from the nth 1-dot delay element and a 2-dot delayed Y signal from the second 1-dot delay element for contour emphasizing frequency setting, based on the Y signal from said first line memory and, n being at least four, a horizontal contour extracting circuit for extracting a horizontal contour component on the basis of the Y signal from the first line memory and the two kinds of delayed Y signals generated by the contour emphasizing frequency setting circuit, and a contour synthesis circuit for synthesizing output contour components from said vertical and horizontal contour extracting circuits, respectively.