Abstract
In the latest Joint Video Exploration Team development, the quadtree plus binary tree (QTBT) block partitioning structure has been proposed for future video coding. Compared to the traditional quadtree structure of High Efficiency Video Coding (HEVC) standard, QTBT provides more flexible patterns for splitting the blocks, which results in dramatically increased combinations of block partitions and high computational complexity. In view of this, a confidence interval based early termination (CIET) scheme is proposed for QTBT to identify the unnecessary partition modes in the sense of rate-distortion (RD) optimization. In particular, a RD model is established to predict the RD cost of each partition pattern without the full encoding process. Subsequently, the mode decision problem is casted into a probabilistic framework to select the final partition based on the confidence interval decision strategy. Experimental results show that the proposed CIET algorithm can speed up QTBT block partitioning structure by reducing 54.7% encoding time with only 1.12% increase in terms of bit rate. Moreover, the proposed scheme performs consistently well for the high resolution sequences, of which the video coding efficiency is crucial in real applications.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1475-1486 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Image Processing |
| Volume | 27 |
| Issue number | 3 |
| DOIs | |
| State | Published - Nov 29 2017 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: This work was supported in part by the National Basic Research Program of China (973 Program, 2015CB351800), National Natural Science Foundation of China (61632001, 61571017), Top-Notch Young Talents Program of China and Shenzhen Peacock Plan, City University of Hong Kong under Project 7200539/CS, which are gratefully acknowledged. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Gene Cheung.