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三维小波视频编码提供了分辨率、时域和质量的可伸缩性。在三维小波编码中,如何调整各小波频带间的码率分配以达到最佳的码率控制至关重要。就小波变换和反变换的结构而言,常规的三维小波视频编码方法会导致解码视频帧沿时间方向播放质量的周期振荡。这种周期的振荡会影响了观看质量。本文研究了重建信号与小波频带问失真分布的关系,提出了一种具有稳定的时域解码质量的率控制方法。实验结果表明该算法在保证播放质量稳定的同时,还具有与常规三维小波视频编码方法近似的平均解码质量。
Three-dimensional wavelet video coding provides resolution, time-domain and quality scalability. In three-dimensional wavelet coding, how to adjust the rate allocation among the wavelet bands to achieve the best rate control is crucial. In the case of wavelet transforms and inverse transforms, conventional methods of three-dimensional wavelet video coding result in periodic oscillations of the quality of the decoded video frame along the time direction. This periodic oscillation can affect the quality of viewing. In this paper, we study the relationship between the reconstructed signal and the distortion distribution in the wavelet band, and propose a rate control method with stable time-domain decoding quality. The experimental results show that the proposed algorithm has the same average decoding quality as the conventional three-dimensional wavelet video coding method while guaranteeing the stable quality of playback.