IMAGE FILTER APPARATUS, DECODER APPARATUS, ENCODER APPARATUS, AND DATA STRUCTURE

摘要

An adaptive filter (110) comprises: a region structure decoding unit (1112) that decodes a new filter coefficient flag indicating whether to use a new filter coefficient for each of a plurality of partial regions constituting a characteristic value region spanned by first and second characteristic values related to unit regions constituting an input image; and a region structure decoding unit (1112) that decodes a candidate selection index designating a filter coefficient assigned before the target partial region in the order of processing.