New rate-distortion modeling and efficient rate control for H.264/AVC video coding

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• 作者：Yimin Zhou ; Yu Sun ; Zhidan Feng ; Shixin Sun
• 关键词：Rate control ; H.264/AVC compression standard ; Video coding ; Rate-distortion model ; Buffer control
• 刊名：Signal Processing: Image Communication
• 出版年：2009
• 出版时间：May 2009
• 年：2009
• 卷：24
• 期：5
• 页码：345-356
• 全文大小：1224 K

文摘

Rate control (RC) is crucial in controlling compression bit rates and qualities for networked video applications. In this paper, we propose a new rate-distortion (R-D) model and an efficient rate control scheme for H.264/AVC video coding, which elegantly resolve the inter-dependency problem between rate-distortion optimization and rate control by eliminating the need of coding complexity prediction for an inter-frame. The objective is to achieve accurate bit rate, obtain optimal video quality while reducing quality variations and simultaneously handling buffer fullness effectively. The proposed algorithm encapsulates a number of new features, including a coding complexity measure for intra-frames, a rate-distortion model, an accurate quantization parameter (QP) estimation for intra-frames, an incremental quantization parameter calculation method for inter-frames, a proportional+integral+derivative (PID) buffer controller, and an intelligent bit-allocation-balancing technique. Our experimental results demonstrate that the proposed scheme outperforms the JVT-G012 solution by providing accurate rate regulation, effectively reducing frame skipping, and finally improving coding quality by up to 1.80 dB.