CPC H04N 19/11 (2014.11) [H04N 19/176 (2014.11); H04N 19/48 (2014.11); H04N 19/593 (2014.11)] | 33 Claims |
1. An apparatus comprising a decoder for decoding a picture from a data stream supporting a first set of intra-prediction modes including a plurality of directional prediction modes and at least one of a DC mode and a planar mode, and a second set of intra-prediction modes, wherein the decoder is configured to:
decode a predetermined block of the picture by:
assigning, based on a first signal in the data stream, the predetermined block to the first set of intra-prediction modes or the second set of intra-prediction modes,
sorting the assigned set of intra-prediction modes according to intra-prediction modes used for neighboring blocks, neighboring the predetermined block, to acquire a list of intra-prediction modes,
deriving, for the predetermined block, from the data stream, an index to an intra-prediction mode in the list of intra-prediction modes,
predicting the predetermined block using the intra-prediction mode to which the index points,
wherein decoder is configured to,
if the predetermined block is assigned to the first set of intra-prediction modes, sorting the assigned set using a second mapping that maps each intra-prediction mode of the second set of prediction modes onto a representative intra-prediction mode in the first set of intra-prediction modes, wherein the second mapping maps a plurality of modes of the second set of intra-prediction modes to a single intra-prediction mode of the first set of intra-prediction modes.
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