CPC H04N 19/50 (2014.11) [H04N 19/105 (2014.11); H04N 19/15 (2014.11); H04N 19/174 (2014.11); H04N 19/30 (2014.11); H04N 19/58 (2014.11); H04N 19/70 (2014.11); H04N 19/172 (2014.11); H04N 19/184 (2014.11)] | 3 Claims |
1. An image decoding method for decoding pictures included in a coded bitstream, the image decoding method comprising:
obtaining, from a sequence header, buffer descriptions that specify reference pictures to be held in a buffer for decoding the pictures, the buffer descriptions including long-term information which identifies a reference picture, among a plurality of reference pictures covered by the buffer descriptions, to be assigned as a long-term reference picture;
obtaining, from a header of a slice in one of the pictures, selecting information for selecting one of the buffer descriptions for decoding the slice;
selecting the one of the buffer descriptions from the buffer descriptions by using the selecting information; and
decoding the slice using the reference picture to be assigned as the long-term reference picture identified by the selected buffer description,
wherein syntax elements included in the sequence header and including the buffer descriptions are applied to all of the pictures in the coded bitstream,
wherein syntax elements included in the header of the slice and including the selecting information are applied to all blocks in the slice,
wherein the long-term information, which is obtained from the sequence header includes, (i) a long-term index for identifying the reference picture to be assigned as the long-term reference picture and (ii) a unique picture order count (POC) number for specifying the reference picture identified by the long-term index, and
wherein the header of the slice further includes information for updating the long-term information by updating the buffer descriptions obtained from the sequence header.
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