Flexible Complexity Control Solution for Transform Domain Wyner-Ziv Video Coding
Flexible Complexity Control Solution for Transform Domain Wyner-Ziv Video Coding
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DOI：
10.1109/tbc.2012.2187611
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发表时间：
2012-06-01
影响因子：
4.5
通讯作者：
Jeon, Byeungwoo
中科院分区：
文献类型：
--
作者：
HoangVan, Xiem;Jeon, Byeungwoo
文献中的大多数Wyner-Ziv(WZ)视频编码解决方案都着眼于提高编码效率。最近，一些论文通过在编码器和解码器之间共享运动估计过程来解决与WZ视频编码的复杂度分配有关的问题。然而，这些方法被证明显著增加了编码过程的计算复杂性，这是由于在编码器处存在运动估计，这在WZ编码应用中不那么有吸引力，因为它们的主要要求是低编码复杂性。为了解决这一问题，我们提出了一种不同的复杂度控制方法，该方法基于WZ帧中的WZ编码和帧内编码之间的自适应选择。这种解决方案比以前的方案更灵活，因为它可以在编码器或解码器实现。提出的帧内模式选择算法利用了变换域Wyner-Ziv视频编码(TDWZ)中的空间和时间相关性，以实现WZ编解码器之间的复杂度控制。实验结果表明，该算法不仅有效地在编解码端分配了计算复杂度，而且在编码端保持了低复杂度的特点。这应该会使其对WZ视频编码范例的大量真实视频应用具有吸引力。此外，在没有帧内模式选择的情况下，传统的TDWZ编解码器的编码效率通过该帧内模式选择算法提高了高达2dB。
Most Wyner-Ziv (WZ) video coding solutions in the literature focus on improving the coding efficiency. Recently, a few papers have addressed problems related to the complexity distribution of WZ video coding by sharing the motion estimation process between the encoder and decoder. However, these methods turn out to significantly increase the computational complexity of the encoding process, due to the presence of motion estimation at the encoder, which is less appealing in WZ coding applications, since their primary requirement is a low-encoding complexity. To address this problem, we propose a different approach to complexity control based on the adaptive selection between WZ and intra coding in the WZ frames. This solution is more flexible than the previous ones in that it can be implemented either at the encoder or decoder. The proposed intra mode selection algorithm exploits the spatial and temporal coherency in the transform domain Wyner-Ziv video coding (TDWZ), in order to achieve complexity control between the WZ encoder and decoder. The experimental results illustrate that the proposed algorithm not only effectively distributes the computational complexity over the encoder and decoder, but also retains the low-complexity feature at the encoder. This should make it attractive for a large number of real video applications of the WZ video coding paradigm. Moreover, the coding efficiency of the conventional TDWZ codec without intra mode decision is improved by up to 2 dB by the proposed intra mode selection algorithm.