Picture signal processing system including spatio-temporal filter

摘要

A picture signal processing for converting a wideband high quality picture signal between interlace and sequential scanning systems is effected through a spatio-temporal filter (2, 7b) based in multi-dimensional co-ordinates consisting of at least vertical frequency and temporal frequency axes. A passing region of the spatio-temporal filter (2, 7b) is restricted to lower regions of the multi-dimensional coordinates including an origin thereof for separating original picture signal components from unnecessary signal components generated by the scanning conversion in order to maintain the high picture quality. The performance of the spatio-temporal filter (2, 7b) is improved in consideration of the motion of the picture and the ambiguous contour of the still picture which is caused by the scanning conversion.