| 摘要 |
<p>Since it has been designed to provide with A/D conversion circuits 30r, 30g and 30b by converting for output analog R, G and B signals to digital signals, a Y signal generation circuit 36 generating Y signals from these digital R, G and B signals, a contour extracting circuit extracting contour components from generated Y signals, and contour adders 34r, 34g and 34b to output signals (R+Yer), (G+Yeg) and (B+Yeb) contour-emphasized by adding this contour component to R, G and B signals output from A/D conversion circuits 30r, 30g and 30b, and may be output by adding contour components after converting analog R, G and B signals to digital signals by A/D conversion circuits 30r, 30g and 30b, no contour emphasizing components are over the dynamic range of the A/D conversion circuit, as a prior example after adding contour components to analog R, G and B signals. For this reason, in case analog R, G and B signals to input in the contour emphasizing circuit of the present invention, and even in case the contour emphasis quantity is "large", neither white crushing nor black crushing is produced when displaying a video by outputting a signal output from the contour emphasizing circuit of the present invention to the display device driven by a digital video signal. <IMAGE></p> |
