Prediction mode grouping and coding bits grouping based on texture complexity for Fast HEVC intra-coding
- PDF / 1,148,524 Bytes
- 18 Pages / 595.276 x 790.866 pts Page_size
- 30 Downloads / 192 Views
ORIGINAL RESEARCH PAPER
Prediction mode grouping and coding bits grouping based on texture complexity for Fast HEVC intra‑coding Jianhua Wang1,2,3 · Bang Ji1 · Haozhan Wang1 · Lianglun Cheng4 Received: 24 January 2020 / Accepted: 7 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract HEVC (High Efficiency Video Coding) as one of the newest international video coding standard, can achieve about 50% bit rate reduction compared with H.264/AVC (Advanced Video Coding) with the same perceptual quality by the use of flexible CTU (coding tree unit) structure, but at the same time, it also dramatically adds its computational complexity for HEVC. To reduce the computational complexity, a fast intra-prediction mode and CU (Coding Unit) size decision algorithm based on prediction mode and coding bits grouping is presented for HEVC intra-encoding in this paper. The contribution of this paper lies in the fact that we successfully use the prediction mode grouping and coding bits grouping technologies to rapidly realize the optimal prediction mode and size decision for the current CU, thus saving much computation complexity for HEVC. Specifically, in our scheme, first, we use grouping technology to group 35 intra-prediction modes into 5 subsets of candidate modes list according to the texture complexity of current PU (Prediction Unit), and each subset only contains 11 intra-prediction modes, which can greatly reduce the traversing and calculating number of candidate mode in RMD (Rough Mode Decision); second, we use coding bits grouping technology to quickly judge whether the current CU needs to be further divided on the basis of the studying of texture complexity in the current CU, which can reduce many unnecessary prediction and partition operations for the current CU; at last we use the fast intra-mode prediction and CU size decision algorithm above to quickly realize the optimal encoding for the current CU in HEVC. As a result, the high computational complexity in HEVC intra-encoding can be efficiently reduced by our proposed scheme. And the simulation results of our experiments show that our proposed fast intra-coding algorithm based on prediction mode and coding bit grouping in this paper can reduce about 49.10% computational complexity on average only at a cost of 0.92% bit rate increase and 0.065 db PSNR decline compared with the standard reference HM16.1algorithm under all-intra-configuration. Keywords HEVC · Intra-coding · Prediction mode grouping · Coding bits grouping · Texture complexity * Jianhua Wang [email protected] Bang Ji [email protected] Haozhan Wang [email protected] Lianglun Cheng [email protected] 1
College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China
2
School of Computer Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
National Center for International Collaboration Research on Precision Agricultural Aviation, Guangzhou 510642, China
4
Faculty of Automation, Guangdong Univer
Data Loading...
