METHOD AND APPARATUS OF DERIVING INTRA PREDICION MODE

摘要

Provided is a method that constructs an MPM group including three intra prediction modes, determines the intra prediction mode of the MPM group specified by the prediction mode index as the intra prediction mode of the current prediction unit if the mode group indicator indicates the MPM group, and derives the intra prediction mode of the current prediction unit using the prediction mode index and the three prediction modes of the MPM group if the mode group indicator does not indicate the MPM group. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

主权项

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 an MPM group including three intra prediction modes; determining whether the mode group indicator indicates the MPM group or not; 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 prediction modes of the MPM group.