Size based transform unit context derivation

Patent metadata

Field	Value
Publication number	US-9948953-B2
Application number	US-201514788395-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Aug 15, 2012
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Systems, apparatus, articles, and methods are described including operations for size based transform unit context derivation.

First claim

What is claimed:

1. A system comprising:
a display;
an antenna configured to receive an encoded bitstream of video data;
a memory to store the bitstream;
a processor communicatively coupled to the display, antenna, and memory; and
decoder circuitry to:
determine a region size for a node of a region quadtree, the region associated with a second region and the region associated with a video frame,
determine a context index value associated with an individual node of the region quadtree based at least in part on the region size, wherein to determine the context index value, the circuitry is to determine a value of 5−log 2(region size), and
determine a split flag based at least in part on the determined context index value; and

wherein the determination of the context index value is performed as part of an entropy context-adaptive binary arithmetic coding (CABAC) coding of transform split flags to determine one or more transform split flags.

2. The system of claim 1 , wherein the region comprises a transform unit (TU), the second region comprises a coding unit (CU), the CU comprises a partition of a picture, and the TU comprises a whole or part of the CU.

3. The system of claim 1 , wherein the determination of the context index value is performed as part of a context adaptive entropy coding operation to determine one or more transform split flags.

4. The system of claim 1 , wherein the context index value comprises one of three potential values.

5. At least one non-transitory article comprising a computer program stored thereon having instructions that, if executed by the computer, cause the computer to:
determine a region size for a node of a region quadtree, the region associated with a second region and the region associated with a video frame,
determine a context index value associated with an individual node of the region quadtree based at least in part on the region size, wherein to determine the context index value, the circuitry is to determine a value of 5−log 2(region size),
determine a split flag based at least in part on the determined context index value, and
wherein the determination of the context index value is performed as part of an entropy context-adaptive binary arithmetic coding (CABAC) coding of transform split flags to determine one or more transform split flags.

6. The non-transitory article of claim 5 , wherein the region comprises a transform unit (TU), the second region comprises a coding unit (CU), the CU comprises a partition of a picture, and the TU comprises a whole or part of the CU.

7. The non-transitory article of claim 5 , wherein the determination of the context index value is performed as part of a context adaptive entropy coding operation to determine one or more transform split flags.

8. The non-transitory article of claim 5 , wherein the context index value comprises one of three potential values.

Assignees

• Intel Corp

Inventors

• Zhang Wenhao
• Chiu Yi-Jen
• Kapsenberg Pieter
• Xu Lidong
• Han Yu
• Deng Zhipin Apple
• Cai Xiaoxia

Classifications

• H04N19/122 Primary

  Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type · CPC title

• H04N19/13

  Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC] · CPC title

• H04N19/96

  Tree coding, e.g. quad-tree coding · CPC title

• H04N19/91

  Entropy coding, e.g. variable length coding [VLC] or arithmetic coding · CPC title

• H04N19/61

  in combination with predictive coding · CPC title