METHOD AND APPARATUS FOR ENCODING INTRA PREDICTION INFORMATION

摘要

A method for encoding an intra prediction mode according to the present invention selects an intra prediction mode for a current block, determines the number of valid MPM candidates by checking the validity of MPM candidates of the current block, and if the number of valid MPM candidates is less than a previously set number, adds additional intra prediction modes as MPM candidates. MPM candidates can be adaptively added on the basis of the directionality of valid MPM candidates. Additionally, during the encoding of residual intra prediction modes, residual intra prediction modes are realigned on the basis of the directionality of valid MPM candidates. Accordingly, the present invention minimizes the information for encoding the intra prediction mode of the current block by adding MPM candidates or realigning the residual intra prediction modes on the basis of the directionality of valid MPM candidates.

主权项

1. A method of encoding intra prediction information, comprising:
determining an intra prediction mode of a current block; constructing a first group including three intra prediction modes using valid intra prediction modes of left and top blocks of the current block; determining an intra prediction mode group indicator and a prediction mode index of the current block; and encoding the intra prediction mode group indicator and the prediction mode index, wherein the intra prediction mode group indicator indicates whether the intra prediction mode of the current block belongs to the first group or a second group, and a method of encoding the prediction mode index varies depending on the intra prediction mode group indicator.