Bildsignalkodierung

摘要

In order to realise a high picture quality with a small information volume, to reduce the hardware scale and to reduce the capacity of the frame buffer of a decoder, a limitation mode decision circuit 34 adaptively changes over a mode of inhibiting interframe predictive coding over the entire macro-blocks in each slice to a mode of inhibiting interfield predictive coding in a frame being encoded over the entire macro-blocks in one slice. As for a B-frame, prediction from its odd field to its even field is inhibited, while prediction from an odd field, such as an Io field, of a reference frame of forward prediction is also inhibited. <IMAGE>