US 10,123,008 B2Granted

Method and apparatus for coding of intra prediction mode

AssigneeHfi Innovation Inc.

InventorsTzu-Der Chuang, Ching-Yeh Chen, Yu-Wen Huang, Shan Liu, Zhi Zhou, Shaw-Min Lei

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Abstract

Embodiments according to the present invention configure the intra prediction mode candidates into multi-level MPM sets, which comprise at least a first-level MPM set and a second-level MPM set. Encoding or decoding a current intra prediction mode is based on the multi-level MPM sets, where one syntax element of the syntax information to be generated or decoded respectively is associated with evaluating the current intra prediction mode using the first-level MPM set. A method and apparatus for chroma intra prediction mode encoding and decoding are also disclosed. The chroma intra prediction mode set includes a Luma-based chroma prediction Mode (LM), a Direct Mode (DM) and four other modes. The codeword set comprises variable-length codewords and fixed-length codewords, and the fixed-length codewords are longer than the variable-length codewords. The variable-length codewords are used for the DM and LM, and the fixed-length codewords are used for the four other modes.

Claims25

Dependent claims

A method for intra prediction mode decoding based on multi-level most probable mode (MPM) sets comprising a first-level MPM set and second-level MPM set, the method comprising:

determining a plurality of MPM candidates for the first-level MPM set, wherein determining the plurality of MPM candidates comprises:
identifying a first MPM candidate based on a mode of a first block;
and
identifying a second MPM candidate based on a mode of a second block;
determining a plurality of most probable remaining mode (MPRM) candidates for the second-level MPM set, wherein determining the plurality of MPRM candidates comprises:
identifying a first MPRM candidate and a second MPRM candidate where the first MPRM candidate and the second MPRM candidate are different from any MPM candidate in the first-level MPM set;
and
decoding syntax information related to a current intra prediction mode corresponding to a third block according to the multi-level MPM sets using a decoder, wherein one syntax element of the syntax information to be decoded is associated with a first MPM flag, wherein decoding the syntax information comprises:
determining the current intra prediction mode using the multi-level MPM sets and the first MPM flag;
and
decoding the third block based on the determined current intra prediction mode.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/123,093Filed 14 Jun 2012 · us provisional application
Priority: 17 Jun 2011
Published: US 2014/0086323 A127 Mar 2014
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04N 19/11
Selection of coding mode or of prediction mode: among a plurality of spatial predictive coding modes
H04N 19/136
Characterised by the element, parameter or criterion affecting or controlling the adaptive coding: incoming video signal characteristics or properties
H04N 19/159
Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter:…
H04N 19/176
The unit being an image region, e.g. an object: the region being a block, e.g. a macroblock

Family

Application61/498,259Us provisional application · filed 17 Jun 2011
Application61/532,942Us provisional application · filed 9 Sep 2011
Application61/532,955Us provisional application · filed 9 Sep 2011
US 2014/0086323 A1Pre-grant publication · published 27 Mar 2014
US 10,123,008 B2This patent

From the US filing history. Foreign family members aren’t listed.

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