Sub-sample transmission system for improving picture quality in motional picture region of wide-band color picture signal

Abstract

In the case where a wide-band color picture signal provided for a high-definition television broadcasting is sub-sampled for narrow-band transmission, in comparison with a stationary picture signal which is applied with sub-sampling according to a sampling pattern circulated at every two frames, the color picture signal in motional picture regions, which is conventionally applied with line-offset sub-sampling at every field, has a lowered resolution. To improve the resolution concerned, color difference signals in motional picture regions are applied with inter-field offset sub-sampling together with band-limitation for preventing aliasing distortion accompanied with subsampling and signal processing including interpolation for reproduction, which are effected in a form completed at every frame. As for motional picture regions having small motion, a luminance signal is applied also with similar sub-sampling and similar signal processing. As a result, the overall picture quality of the reproduced motional color picture is improve by signal processing thus adapted for color pictures in motional picture regions.

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