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Li Liu

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Proceedings Article | 19 January 2009 Paper

A novel frame-level constant-distortion bit allocation for smooth H.264/AVC video quality

Li Liu, Xinhua Zhuang

Proceedings Volume 7257, 72570T (2009) https://doi.org/10.1117/12.805900

KEYWORDS: Computer programming, Distortion, Video, Quantization, Detection and tracking algorithms, Signal processing, Video coding, Silicon, Visualization, Optimization (mathematics)

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It is known that quality fluctuation has a major negative effect on visual perception. In previous work, we introduced a constant-distortion bit allocation method [1] for H.263+ encoder. However, the method in [1] can not be adapted to the newest H.264/AVC encoder directly as the well-known chicken-egg dilemma resulted from the rate-distortion optimization (RDO) decision process. To solve this problem, we propose a new two stage constant-distortion bit allocation (CDBA) algorithm with enhanced rate control for H.264/AVC encoder. In stage-1, the algorithm performs RD optimization process with a constant quantization QP. Based on prediction residual signals from stage-1 and target distortion for smooth video quality purpose, the frame-level bit target is allocated by using a close-form approximations of ratedistortion relationship similar to [1], and a fast stage-2 encoding process is performed with enhanced basic unit rate control. Experimental results show that, compared with original rate control algorithm provided by H.264/AVC reference software JM12.1, the proposed constant-distortion frame-level bit allocation scheme reduces quality fluctuation and delivers much smoother PSNR on all testing sequences.

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