TIME-VARYING IMAGE ENCODER

摘要

Effectively using the ability of prediction by means of low-definition local decoded signal for predictive coding, the coding efficiency of a time-varying image encoder is improved. In a time-varying image encoder in which high-definition picture signal is subjected to predictive coding and low-definition picture signal produced by the conversion of the high-definition picture signal is encoded; a low-definition picture is created by removing one field from one frame through a field skipping circuit (102) (thinning) and by subjecting the other field to down-sampling through a down-sampling circuit (29), low-definition prediction signal is produced by subjecting the low-definition picture to up-sampling through an up-sampling circuit (35), high-definition prediction signal corresponding to the removed field is produced from the high-definition picture, and prediction signal is produced by combining alternately the low- and high-definition prediction signals through predictor (104). <IMAGE>