Extended Coding Unit Partitioning for Future Video Coding

The flexible partitioning structure such as quad-tree plus binary-tree (QTBT) plays important roles in the next generation video coding standard. This paper investigates new coding unit (CU) partitioning methods to further improve the compression efficiency. In particular, we propose the extended qu...

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Bibliographic Details
Published in:IEEE transactions on image processing Vol. 29; pp. 2931 - 2946
Main Authors: Wang, Meng, Li, Junru, Zhang, Li, Zhang, Kai, Liu, Hongbin, Wang, Shiqi, Kwong, Sam, Ma, Siwei
Format: Journal Article
Language:English
Published: United States IEEE 01.01.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
asymmetric ternary-tree partitioning
Asymmetry
Coding
Coding standards
Copper
CU partitioning
Decoding
Delay
Encoding
Image coding
Next generation networking
Partitioning
quad-tree partitioning
Random access
Video coding
ISSN:1057-7149, 1941-0042, 1941-0042
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Summary:The flexible partitioning structure such as quad-tree plus binary-tree (QTBT) plays important roles in the next generation video coding standard. This paper investigates new coding unit (CU) partitioning methods to further improve the compression efficiency. In particular, we propose the extended quad-tree partitioning and asymmetric ternary-tree partitioning to further develop the principle behind the existing partitioning structure. First, a central extended quad-tree (CENTRAL-EQT) partitioning is introduced, which extends the traditional QT partitioning with central pattern and generates four elaborately designed sub-CUs with different sizes. Second, we propose a parallel extended quad-tree (PARALLEL-EQT) partitioning that allows the CU to split along a single direction, leading to four identical size sub-blocks. Third, we present an asymmetric ternary-tree (ATT) method, which splits the CU asymmetrically into three sub-blocks. The proposed new partitioning methods allow the interleaving with binary-tree partitioning for enhanced adaptability, and they can be jointly enabled to capture different characteristics of the local content. Simulation results on the JEM7-QTBT-Only platform show that averagely 4.92%, 4.81% and 5.08% BD-Rate savings are achieved for the luma component by the proposed methods under random access (RA), low-delay P (LDP) and low-delay B (LDB) configurations, respectively, with around 725% encoding time increase and negligible decoding time increase. Furthermore, experimental results also reveal that the proposed partitioning schemes are effective when cooperating with the upcoming Versatile Video Coding standard.
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ISSN:1057-7149
1941-0042
1941-0042
DOI:10.1109/TIP.2019.2955238