Lagrangian Multiplier Adaptation for Rate-Distortion Optimization With Inter-Frame Dependency

Rate-distortion optimization (RDO) is widely used in video coding, which plays a critical role in enhancing the coding efficiency substantially. Currently, the RDO process is performed in a way that coding efficiency of each coding unit (CU) is maximized independently without considering the depende...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems for video technology 2016-01, Vol.26 (1), p.117-129
Main Authors: Li, Shuai, Zhu, Ce, Gao, Yanbo, Zhou, Yimin, Dufaux, Frederic, Ming-Ting Sun
Format: Article
Language:English
Subjects:
Circuits
Coding
Computer programs
Delay
Dependence
Distortion
Efficiency
Encoding
Engineering Sciences
Gain
high-rate assumption
Multipliers
Optimization
Optimization techniques
Quantization (signal)
Rate-distortion
Rate-distortion optimization
RDO
Signal and Image processing
State of the art
Video coding
Video compression
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Summary:Rate-distortion optimization (RDO) is widely used in video coding, which plays a critical role in enhancing the coding efficiency substantially. Currently, the RDO process is performed in a way that coding efficiency of each coding unit (CU) is maximized independently without considering the dependency among CUs. As we know, in the current hybrid video coding structure, spatial/temporal prediction techniques are extensively used, which introduce strong dependency among CUs. In this paper, we investigate RDO with inter-frame dependency, where the impact of coding performance of the current CU on that of the following frames is considered. Accordingly, an RDO scheme taking the inter-frame dependency into account is proposed by adapting the Lagrangian multiplier. The experimental results show that the proposed scheme can achieve about 3.22% and 3.19% BD-rate saving in average over the state-of-the-art High Efficiency Video Coding (HEVC) reference software HM15.0 in the low-delay P (LDP) and low-delay B (LDB) coding structures, respectively, with no extra encoding time. The proposed scheme can obtain a significantly higher coding gain than the multiple quantization parameter (MQP) (±3) optimization technique that would greatly increase the encoding time by a factor of about six. Coupled with MQP optimization, the proposed scheme can further achieve about 5.96% and 5.57% BD-rate savings in average over the HEVC and about 4.03% and 4.07% over the HEVC with MQP optimization, under the specified common test conditions for LDP and LDB coding structures, respectively.
ISSN:1051-8215
1558-2205
DOI:10.1109/TCSVT.2015.2450131