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首页> 外文期刊>IEEE transactions on multimedia >A Fast FoV-Switching DASH System Based on Tiling Mechanism for Practical Omnidirectional Video Services
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A Fast FoV-Switching DASH System Based on Tiling Mechanism for Practical Omnidirectional Video Services

机译：一种快速FOV开关划线系统，基于PTILING机制实现实用全向视频服务

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摘要

With the development of multimedia technologies and virtual reality display devices, omnidirectional videos have gained popularity nowadays. To reduce the bandwidth requirement for omnidirectional video transmission, tile-based viewport adaptive streaming methods have been proposed in the literatures. Challenges related to decoding the tiles simultaneously with limited number of decoders, and ensuring user's viewing experience during the viewport switch are still to be solved. In this paper, a two-layer fast viewport switching dynamic adaptive streaming over HTTP (DASH) system based on tiling mechanism is proposed, which incorporates the viewing trajectory of end users. To deal with the simultaneously decoding problem, an open group of picture (GOP) technique is proposed to enable merging different types of tiles into a composite stream at the client side. To reduce the quality recovery duration after the viewport change, a fast-switching strategy is also proposed. Moreover, considering the priorities of different types of chunks, a download strategy is further proposed to adapt the bandwidth fluctuations and viewport changes. Experimental results showed that the proposed system can significantly reduce the recovery duration of high quality video by approximately 90%, which can provide a better viewing experience to end users.
机译：随着多媒体技术和虚拟现实显示设备的开发，现在的全向视频已经越来越受欢迎。为了减少全向视频传输的带宽要求，在文献中已经提出了基于Tile的视口自适应流方法。与有限数量的解码器同时解码瓦片的挑战，并确保在视口交换机期间的用户的观看体验仍然被解决。在本文中，提出了一种基于平铺机制的HTTP（DASH）系统的双层快速视口切换动态自适应流，其中包含最终用户的观看轨迹。为了处理同时解码问题，提出了一种打开的图片（GOP）技术（GOP）技术，以使将不同类型的图块合并到客户端的复合流中。为了降低视口变化后的质量恢复持续时间，还提出了一种快速切换策略。此外，考虑到不同类型块的优先级，还提出了一种下载策略来调整带宽波动和视口变化。实验结果表明，所提出的系统可以显着降低高质量视频的恢复持续时间大约90％，这可以为最终用户提供更好的观看体验。

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