Method and apparatus of deriving intra prediction mode using most probable mode group

Patent metadata

Field	Value
Publication number	US-8948259-B2
Application number	US-201214349985-A
Country	US
Kind code	B2
Filing date	Nov 2, 2012
Priority date	Nov 4, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

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.

First claim

The invention claimed is:

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;
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 predic…

Assignees

• Infobridge Pte Ltd

Inventors

• Oh Soo Mi
• Yang Moonock

Classifications

• H04N19/124

  Electricity · mapped topic

• H04N19/159 Primary

  Electricity · mapped topic

• H04N19/157

  Electricity · mapped topic

• H04N19/129

  Electricity · mapped topic

• H04N19/61

  Electricity · mapped topic