Moving picture signal progressive coding system

Claim 2

A progressive coding system wherein a moving picture signal in a present frame is separated into a low frequency component or a little luminance variation in the present frame and a high frequency component of much luminance variation in the present frame, and the components are respectively coded by motion compensated predictive coding, the system characterized by comprising: motion detection means (20) for respectively detecting motion quantities on the low frequency component in the present frame and low frequency components in previous and subsequent intraframes to the present frame; first motion compensation means (40) for respectively motion-compensating the low frequency components in the previous and subsequent intraframes according to the respective motion quantities to produce first and second pre-predictive low frequency components, weighting the pre-predictive low frequency components according to time intervals between the frames thereof to add the pre-predictive low frequency components thus weighted to each other, thus producing a third pre-predictive low frequency component, selecting one of the first, second and third pre-predictive low frequency components, of the least predictive error, as a predictive low frequency component for the motion compensated predictive coding and outputting a selection signal indicating which is selected among the first, second and third pre-predictive low frequency components; motion quantity modification means (110a) for respectively modifying the motion quantities according to a sampling ratio of the moving picture signal and low frequency component; and second motion compensation means (110b) responsive to the selection signal for producing a predictive high frequency component on the basis of the modified motion quantities and the high frequency component of either the previous or subsequent intraframe or both the intraframes in a manner identical to that in which the selected one of the first, second and third pre-predictive low frequency components is produced.

Claim 3

A progressive coding system wherein a moving picture signal is divided into a low frequency component of a little luminance variation and a high frequency component of much luminance variation, and the components are respectively coded by motion compensated predictive coding, the system characterized by comprising: motion quantity modification means (20c) for modifying a motion quantity of the moving picture signal according to a sampling ratio of the moving picture signal and low frequency component; first motion compensation means (4) for motion-compensating the low frequency component according to the motion quantity thus modified; and second motion compensation means (11b) for motion-compensating the high frequency component according to the motion quantity thus modified.