IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE AND THEIR METHODS

摘要

A weighting-factor mode determining part (13) determines, based on the value of a graph "AFF" indicating whether to switch the field and frame on a block-by-block basis, whether the mode is a field mode or a frame mode, and notifies switches (14,15) and a multiplexing part (106) of the mode. The switches (14,15) perform selection of field/frame in accordance with the notified mode. A field weighting-factor encoding part (11) or a frame weighting-factor encoding part (12), when selected, performs a weighting-factor encoding.