虚拟现实视频传输架构和关键技术

[摘要] 介绍了虚拟现实（VR）视频传输架构，提出了两种传输方式：全景传输和视点传输。全景传输可提供多角度质量均匀的图像，但存在高码率和带宽浪费问题；视点传送仅传输视点范围内图像，可减少码率浪费，但存在头部运动延迟问题。提出的视点自适应传输技术、视点预测方法，可以较好地实现低码率、高质量的VR视频传输。

[关键词] VR视频；视点自适应传输；非均匀映射传输；分块传输；视点预测；用户质量优化

[Abstract] In this paper, a main framework of virtual reality (VR) video transmission is introduced, and two schemes are also proposed: panorama transmission and viewport transmission. The panorama transmission can provide 360°symmetric image with high bit-rate and bandwidth wasting; the viewport transmission only transmits a part of images so as to reduce bit-rate wasting, but can cause head movement delay. In this paper, viewport-adaptive streaming and viewport prediction technologies are introduced, which enable high quality service of VR video streaming.

[Keywords] VR video; viewport adaptation streaming; asymmetric projection streaming; tile-based streaming; viewport prediction; QoE optimization