Unified distributed source coding frames for interactive multiview video streaming
Unified distributed source coding frames for interactive multiview video streaming
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DOI：
10.1109/icc.2012.6363933
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
Zhi Liu;Gene Cheung;Yusheng Ji
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文献类型：
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作者：
Zhi Liu;Gene Cheung;Yusheng Ji
由于标准视频压缩算法中使用差分编码来利用相邻帧的时间相关性来获得编码增益，因此网络中丢失的帧将导致解码器后续帧中的错误传播。先前提出的分布式源编码（DSC）可以通过克服编码器中帧将在解码器中正确接收的不确定性来周期性地插入帧以阻止这种错误传播，而无需诉诸于大量的内部编码i帧in交互式多视图视频(IMVS)的情况下,用户看一个M可以捕获的观点但可以周期性地选择并切换到相邻视图编码器必须编码多视图视频启用这个view-switching交互性不知道确切的观点轨迹被观众在流时间在本文中,我们提出一个统一的DSC框架结构IMVS这样编码器coding-efficient方式可以克服这两种类型的不确定性;即在差分编码的多视场视频中停止错误传播，并促进周期性的交互式视图切换，同时利用额外的统一的DSC帧，我们设计了一种多视场帧结构，在给定带宽约束下，使解码器正确解码的帧数最大化。我们开发了一种快速的算法来找到局部最优的结构参数以及传输的分组和分组重排序策略。实验结果表明，我们的算法可以有效地减少错误传播在典型网络条件下，使用统一DSC帧的优化帧结构在正确解码帧的比例上仅比使用I和p帧的naïve结构高出49%。
Because of differential coding used in standard video compression algorithms to exploit temporal correlation in adjacent frames for coding gain a frame lost in network will cause error propagation in subsequent frames at the decoder Previously proposed distributed source coding (DSC) frames can be periodically inserted to halt this error propagation by overcoming the uncertainty at encoder of which frames will be correctly received at decoder without resorting to large intra-coded I-frames In the case of interactive multiview video streaming (IMVS) where a user watches one of M available captured views at a time but can periodically select and switch to a neighboring view the encoder must encode multiview video to enable this view-switching interactivity without knowing the exact view trajectories taken by viewers at stream time In this paper we propose a unified DSC frame construction for IMVS so that the encoder can overcome both types of uncertainty in a coding-efficient manner; ie halt error propagation in differentially coded multiview video and facilitate periodic interactive view-switching at the same time Having the additional unified DSC frames we design a multiview frame structure to maximize the expected number of correctly decoded frames at decoder for a given bandwidth constraint We develop a fast algorithm to find locally optimal structure parameters and packetization and packet reordering strategies for transmission Experimental results show that our optimized frame structures using unified DSC frames outperform naïve structures using I- and P-frames only by up to 49% in fraction of correctly decoded frames under typical network condition.