Zhang, Guang Yao, Abdelazim, Abdelrahman, Mein, Stephen James, Varley, Martin Roy and Ait-Boudaoud, Djamel (2011) A simplified rate control algorithm for H.264/SVC. In: Visual Information Processing XX, 26 April 2011, Orlando, Florida, USA.
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Official URL: http://dx.doi.org/10.1117/12.886988
The objective of scalable video coding is to enable the generation of a unique bitstream that can adapt to various bitrates, transmission channels and display capabilities. The scalability is categorised in terms of temporal, spatial, and quality. Effective Rate Control (RC) has important ramifications for coding efficiency, and also channel bandwidth and buffer constraints in real-time communication. The main target of RC is to reduce the disparity between the actual and target bit-rates. In order to meet the target bitrate, a predicted Mean of Absolute Difference (MAD) between frames is used in a rate-quantisation model to obtain the Quantisation Parameter (QP) for encoding the current frame. The encoding process exploits the interdependencies between video frames; therefore the MAD does not change abruptly unless the scene changes significantly. After the scene change, the MAD will maintain a stable slow increase or decrease. Based on this observation, we developed a simplified RC algorithm. The scheme is divided in two steps; firstly, we predict scene changes, secondly, in order to suppress the visual quality, we limit the change in QP value between two frames to an adaptive range. This limits the need to use the rate-quantisation model to those situations where the scene changes significantly. To assess the proposed algorithm, comprehensive experiments were conducted. The experimental results show that the proposed algorithm significantly reduces encoding time whilst maintaining similar rate distortion performance, compared to both the H.264/SVC reference software and recently reported work.
|Item Type:||Conference or Workshop Item (Paper)|
|Additional Information:||Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.|
|Subjects:||Computer science > Computer architectures & operating systems|
|Schools:||Faculty of Science and Technology > School of Engineering|
|Deposited By:||Carmit Erez|
|Deposited On:||05 Jul 2012 11:41|
|Last Modified:||09 Aug 2016 15:16|
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