COLOUR VIDEO SIGNAL PROCESSING

摘要

A filter adaptively filters a PAL (or NTSC) luminance signal so as to attenuate the high frequency portion of the luminance band, in which the chrominance information lies, when movement is detected. This reduces cross-colour in the reproduced picture. Movement is detected by comparing (20) the undelayed luminance signal with this signal delayed (18) by an integral number of lines corresponding substantially to one field or one picture. The resultant is applied to a ROM (22) which provides a multiplier coefficient to a multiplier (26) at the output of a high-pass filter circuit (16) in the luminance channel. The filter may precede a coder or follow a decoder.