8,372 research outputs found
Video Quality Evaluation for Tile-Based Spatial Adaptation
The demand for very high-resolution video
content in entertainment services (4K, 8K, panoramic,
360 VR) puts an increasing load on the distribution
network. In order to reduce the network usage in
existing delivery infrastructure for such services while
keeping a good quality of experience, dynamic spatial
video adaptation at the client side is seen as a key
feature, and is actively investigated by academics and
industrials. However, the impact of spatial adaptation
on quality perception is not clear. In this paper, we propose
a methodology for the evaluation of such adapted
content, conduct a series of perceived quality measurements
and discuss results showing potential benefits
and drawbacks of the technique. Based on our results,
we also propose a signaling mechanism in MPEGDASH
to assist the client in its spatial adaptation log
Design and evaluation of tile selection algorithms for tiled HTTP adaptive streaming (Best paper award)
The future of digital video is envisioned to have an increase in both resolution and interactivity. New resolutions like 8k UHDTV are up to 16 times as big in number of pixels compared to current HD video. Interactivity includes the possibility to zoom and pan around in video. We examine Tiled HTTP Adaptive Streaming (TAS) as a technique for supporting these trends and allowing them to be implemented on conventional Internet infrastructure. In this article, we propose three tile selection algorithms, for different use cases (e.g., zooming, panning). A performance evaluation of these algorithms on a TAS testbed, shows that they lead to better bandwidth utilization, higher static Region of Interest (ROI) video quality and higher video quality while manipulating the ROI. We show that we can transmit video at resolutions up to four times larger than existing algorithms during bandwidth drops, which results in a higher quality viewing experience. We can also increase the video quality by up to 40 percent in interactive video, during panning or zooming
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