On the effectiveness of offset projections for 360-degree video streaming

Chao Zhou, Zhenhua Li, Joe Osgood, Yao Liu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A new generation of video streaming technology, 360-degree video, promises greater immersiveness than standard video streams. This level of immersiveness is similar to that produced by virtual reality devices-users can control the field of view using head movements rather than needing to manipulate external devices. Although 360-degree video could revolutionize the streaming experience, its large-scale adoption is hindered by a number of factors: 360-degree video streams have larger bandwidth requirements and require faster responsiveness to user inputs, and users may be more sensitive to lower quality streams. In this article, we review standard approaches toward 360-degree video encoding and compare these to families of approaches that distort the spherical surface to allow oriented concentrations of the 360-degree view. We refer to these distorted projections as offset projections. Our measurement studies show that most types of offset projections produce rendered views with better quality than their nonoffset equivalents when view orientations are within 40 or 50 degrees of the offset orientation. Offset projections complicate adaptive 360-degree videostreaming because they requirea combination of bitrate and view orientation adaptations. We es-timate that this combination of streaming adaptation in two dimensions can cause over 57% extra segments to be downloaded compared to an ideal downloading strategy, wasting 20% of the total downloading bandwidth.

Original languageEnglish (US)
Article number62
JournalACM Transactions on Multimedia Computing, Communications and Applications
Volume14
Issue number3s
DOIs
StatePublished - Jun 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Computer Networks and Communications

Keywords

  • 360-degree video streaming
  • Adaptive streaming
  • Offset projection
  • Visual quality

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