Information Technology Reference
In-Depth Information
3.5 Mobile Video Quality Measurements and Predictions
3.5.1 introduction
This section addresses the video quality prediction from a source to a
mobile terminal by using the information of video type and channel status.
In particular, when a user requires a video clip from a source mobile device
(Laptop, PDA. or Smart Phone), he has many methods to get it like using
the interface of Wifi, 3G PSN, or 3G Circuit Switched Network, as depicted
in Figure 3.16. The Wifi has more bandwidths and a lower cost but least
coverage. The 3G Circuit Switched Network has lowest delay and largest
coverage but cost much. In our work, an algorithm is given to predict the
video quality. Then the user could choose the interface that has the best
quality for video transmission.
3.5.2 Video Measurements
For video measurements, we use PEVQ as a video quality judgment stan-
dard. The PEVQ is an end-to-end measurement algorithm to provide mean
opinion score (MOS) of the video quality of IPTV, streaming video, mobile
TV, and video telephony. The scope for PEVQ is to measure degradations of
the picture quality occurring through a network by analyzing the degraded
video signal output from the network. This Quality-of-Experience (QoE) test-
ing is based on modeling the behavior of the human visual tract and besides
an overall quality MOS score (as a figure of merit) abnormalities in the video
signal are quantified by a variety of performance indicator (KPIs), including
peak signal-to-noise ratio (PSNR), distortion indicators, and lip-sync delay.
WIFI
Wired
Laptop
WIFI
Video source
User
PDA
WIFI
3G packet switch
3G circuit switch
Servers
Smart phone
Figure 3.16
User requires the video stream from video source. (From Tso, F. P., “WTS” Conference of IEEE,
2008.)
