Adaptive contour compensation device

Abstract

PURPOSE: To reduce emphasized noise by expanding noise into horizontal and vertical directions, switching a digital video signal subject to contour compensation into a through digital video signal and outputting a digital signal not subject to contour compensation for a video signal including noise. CONSTITUTION: A noise detection circuit 9 detects noise from a frame difference of a video signal calculated by a subtraction circuit 8 and a detection signal expansion circuit 10 expands the detected noise signal into horizontal and vertical directions. A switch circuit 12 selects a digital video signal subject to contour compensation when the expanded detection signal is not outputted and selects the digital video signal not subject to contour compensation when outputted. Thus, when a video signal including noise is inputted, since a through- signal not subject to contour compensation is outputted, the output of the noise subject to contour compensation and emphasized is prevented. COPYRIGHT: (C)1991,JPO&Japio

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