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Spatial and temporal consistency-aware dynamic adaptive streaming for 360-degree videos
IEEE Journal of Selected Topics in Signal Processing ( IF 7.5 ) Pub Date : 2020-01-01 , DOI: 10.1109/jstsp.2019.2957981
Hui Yuan , Shiyun Zhao , Junhui Hou , Xuekai Wei , Sam Kwong

The 360-degree video allows users to enjoy the whole scene by interactively switching viewports. However, the huge data volume of the 360-degree video limits its remote applications via network. To provide high quality of experience (QoE) for remote web users, this paper presents a tile-based adaptive streaming method for 360-degree videos. First, we propose a simple yet effective rate adaptation algorithm to determine the requested bitrate for downloading the current video segment by considering the balance between the buffer length and video quality. Then, we propose to use a Gaussian model to predict the field of view at the beginning of each requested video segment. To deal with the circumstance that the view angle is switched during the display of a video segment, we propose to download all the tiles in the 360-degree video with different priorities based on a Zipf model. Finally, in order to allocate bitrates for all the tiles, a two-stage optimization algorithm is proposed to preserve the quality of tiles in FoV and guarantee the spatial and temporal smoothness. Experimental results demonstrate the effectiveness and advantage of the proposed method compared with the state-of-the-art methods. That is, our method preserves both the quality and the smoothness of tiles in FoV, thus providing the best QoE for users.

中文翻译:

用于 360 度视频的时空一致性感知动态自适应流媒体

360度视频让用户可以通过交互切换视口来欣赏整个场景。然而,360度视频庞大的数据量限制了其通过网络进行远程应用。为了为远程网络用户提供高质量的体验 (QoE),本文提出了一种基于图块的 360 度视频自适应流媒体方法。首先,我们提出了一种简单而有效的速率自适应算法,通过考虑缓冲区长度和视频质量之间的平衡来确定下载当前视频片段所需的比特率。然后,我们建议使用高斯模型来预测每个请求视频片段开头的视野。为了处理视频片段显示过程中视角切换的情况,我们建议基于 Zipf 模型以不同的优先级下载 360 度视频中的所有图块。最后,为了为所有瓦片分配比特率,提出了一种两阶段优化算法来保持 FoV 中瓦片的质量并保证空间和时间的平滑度。实验结果证明了所提出的方法与最先进的方法相比的有效性和优势。也就是说,我们的方法同时保留了 FoV 中瓷砖的质量和平滑度,从而为用户提供了最佳的 QoE。实验结果证明了所提出的方法与最先进的方法相比的有效性和优势。也就是说,我们的方法同时保留了 FoV 中瓷砖的质量和平滑度,从而为用户提供了最佳的 QoE。实验结果证明了所提出的方法与最先进的方法相比的有效性和优势。也就是说,我们的方法同时保留了 FoV 中瓷砖的质量和平滑度,从而为用户提供了最佳的 QoE。
更新日期:2020-01-01
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