Motion compensated refinement for low complexity pixel based distributed video coding
Motion compensated refinement for low complexity pixel based distributed video coding
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DOI：
10.1109/avss.2005.1577335
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
J. Ascenso;Catarina Brites;F. Pereira
中科院分区：
文献类型：
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作者：
J. Ascenso;Catarina Brites;F. Pereira
分布式视频编码(DVC)是一种新的编码范例，它能够在解码器部分或全部利用视频统计。DVC的一种特殊情况，即Wyner-Ziv编码，在解码器处处理具有边信息的有损信源编码，并且允许将复杂度从编码器转移到解码器，理论上不会对编码效率造成任何损失。这里描述的Wyner-Ziv解决方案独立地对每个视频帧进行编码(帧内编码)，但有条件地对相同帧进行解码(帧间解码)。在解码器，补偿工具负责使用先前解码的(时间上相邻的)帧来获得原始帧的准确内插。提出了一种新的改进像素域Wyner-Ziv视频编码性能的方法，该方法利用运动补偿对解码帧进行细化，并将其用作改进的边信息。更准确地说，在对每一帧进行部分解码时，解码器改进其运动轨迹，以便实现对解码帧的更好重建。
Distributed video coding (DVC) is a new coding paradigm that enables to exploit video statistics, partially or totally at the decoder. A particular case of DVC, Wyner-Ziv coding, deals with lossy source coding with side information at the decoder and allows a shift of complexity from the encoder to the decoder, theoretically without any penalty in the coding efficiency. The Wyner-Ziv solution here described encodes each video frame independently (intraframe coding), but decodes the same frame conditionally (interframe decoding). At the decoder, and compensation tools are responsible to obtain an accurate interpolation of the original frame using previously decoded (temporally adjacent) frames. This paper proposes a novel approach to improve the performance of pixel domain Wyner-Ziv video coding by using a motion compensated refinement of the decoded frame and use it as improved side information. More precisely, upon partial decoding of each frame, the decoder refines its motion trajectories in order to achieve a better reconstruction of the decoded frame.