Patent ID: 9167251
Filing Date: 2015-10-20
Classification: H04N

Abstract:
1. A method of deriving an intra prediction mode of a current prediction unit, comprising: entropy-decoding a mode group indicator and a prediction mode index; constructing a Most Probable Mode (MPM) group including three intra prediction modes using a left intra prediction mode and an above intra prediction mode of the current prediction unit; if the mode group indicator indicates the MPM group, determining an intra prediction mode of the MPM group specified by the prediction mode index as the intra prediction mode of the current prediction unit; and if the mode group indicator does not indicate the MPM group, deriving the intra prediction mode of the current prediction unit using the prediction mode index and the three intra prediction modes of the MPM group, wherein when the left intra prediction mode is equal to the above intra prediction mode and is one of two non-directional intra prediction modes, the MPM group includes two non-directional intra prediction modes and a vertical mode, wherein deriving the prediction mode of the current prediction unit using the prediction mode index and the three intra prediction modes of the MPM group comprises ordered sub-steps of: