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Layered multiple description video coding using dual-tree discrete wavelet transform and H.264/AVC

机译：使用双树离散小波变换和H.264 / AVC的分层多描述视频编码

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摘要

A novel hybrid layered multiple description video coding (HLMDVC) algorithm is proposed to provide a robust and flexible video transmission via unreliable networks, like Internet or the wireless network. First, the input video sequence is encoded by a standard H.264/AVC encoder in low bit rate to form the base layer, which is then duplicated to each description. Second, the 3D dual-tree discrete wavelet transform is performed on the difference between the reconstructed base layer and the input sequence to produce four wavelet coefficient trees. Then the noise shaping is used to reduce the redundancy of these coefficient trees. After that, the four sparse wavelet coefficient trees are separately encoded by 3D-SPIHT encoders. The resulted four bitstreams are partitioned into two groups, separately forming enhancement layers of two descriptions. The redundancy of the proposed multiple description video coding scheme can be easily adjusted by changing the bitrate of the base layer to fit for different transmission channels. The directional selectivity feature of 3D dual-tree discrete wavelet transform frees the enhancement layer coding from the time consuming motion estimation, such that no mismatch happens and the coding efficiency is improved. Simulation results have shown that the quality of the reconstructed video of the proposed HLMDVC algorithm is superior to that by the state-of-the-art multiple description video coding methods.
机译：提出了一种新颖的混合分层多描述视频编码（HLMDVC）算法，以通过不可靠的网络（例如Internet或无线网络）提供鲁棒且灵活的视频传输。首先，输入视频序列由标准H.264 / AVC编码器以低比特率编码，以形成基础层，然后将其复制到每个描述中。其次，对重建的基础层和输入序列之间的差异执行3D双树离散小波变换，以生成四个小波系数树。然后，使用噪声整形来减少这些系数树的冗余。之后，由3D-SPIHT编码器分别编码这四个稀疏小波系数树。将得到的四个比特流划分为两组，分别形成两个描述的增强层。通过改变基础层的比特率以适合不同的传输信道，可以容易地调节所提出的多描述视频编码方案的冗余。 3D双树离散小波变换的方向选择性功能使增强层编码从费时的运动估计中解放出来，从而不会发生失配，从而提高了编码效率。仿真结果表明，所提出的HLMDVC算法的重构视频质量优于最新的多描述视频编码方法。

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