Name
Abstract | ||
|---|---|---|
With the continuously increasing attention that 360° video streaming is drawing, several solutions have been developed lately. They can be grouped into two main categories, with the first one being the
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">viewport-independent</italic>
category that consists of encoding the whole 360° video content using a particular projection, e.g., Equirectangular Projection or Cubemap Projection, without taking any viewport orientation into account. Such approaches waste resources since content not being watched by the user is encoded with the same visual fidelity as the content actually watched. The second category, the
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">viewport-dependent</italic>
category, relies on techniques that allow for viewport adaptivity. One approach is to apply viewport-dependent projections, wherein the spherical 360° video is mapped onto a rectangular frame in such a way that a specific viewport is mapped to a comparatively larger part of the rectangular frame than the rest of the content. Another approach, as specified in MPEG OMAF, is to use tile-based streaming, with the 360° video being offered in a tiled manner at various resolutions. Thus, each user can retrieve the tiles at different resolutions so that the high-resolution tiles match its viewport. Although viewport-dependent approaches allow providing better visual quality at the viewport, the end-to-end delay is critical, since it has an impact on the time needed by clients to adapt to user movements so that movements are reflected on the retrieved content. In this paper, we analyze the impact of the delay and introduce various means to reduce the impact on the observed fidelity. |
Year | DOI | Venue |
|---|---|---|
2019 | 10.1109/JETCAS.2019.2899516 | IEEE Journal on Emerging and Selected Topics in Circuits and Systems |
Keywords | Field | DocType |
Streaming media,Encoding,Decoding,Delays,Transform coding,Visualization,Circuits and systems | Fidelity,Computer graphics (images),Viewport,Cube mapping,Visualization,Computer science,Equirectangular projection,Transform coding,Real-time computing,Decoding methods,Encoding (memory) | Journal |
Volume | Issue | ISSN |
9 | 1 | 2156-3357 |
Citations | PageRank | References |
1 | 0.36 | 0 |
Authors | ||
5 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yago Sanchez de la Fuente | 1 | 100 | 8.38 |
| Gurdeep Singh Bhullar | 2 | 1 | 1.71 |
| Robert Skupin | 3 | 37 | 9.10 |
| C. Hellge | 4 | 328 | 32.26 |
| Thomas Schierl | 5 | 563 | 58.53 |