Abstract
The inclusion of multimedia content in different web-based services has increased significantly. Through an extensive subjective testing campaign, we analyse the quality of experience concerning video transmissions associated to these types of services when accessed from mobile devices and mobile Internet connections. Contrary to traditional normalised quality assessment studies, we point out the service context as a key aspect in quality assessments. Specifically, we analyse the impact of the duration of the test material on quality assessments. We find out that tolerance to visual degradations is higher in the specific context of use compared to when using standardised methodologies for quality assessment, which has a significant impact in terms of commercial service acceptability.
Highlights
The inclusion of multimedia content in different web-based services has increased significantly
Quality in video transmissions has been thoroughly studied in recent years, it has been commonly associated to visual quality [1,2] instead of addressing the problem from a pure service standpoint
For each considered video clip, we show the evolution of the resulting structural similarity index (SSIM) respect to the original sequence, as a means for estimating the severity of the impairments from an objective quality metric standpoint
Summary
This paper illustrates a series of experiments aimed at analyzing the QoE for different media-enriched web-based services in a mobile context. Context of use was explored using (1) video property and length (2) mobile access and (3) the methodology for assessing user experience. Users were asked to evaluate the impact of similar visual impairments in two contexts: (1). Using common test video sequences and including typical wireless degradations, and (2) including similar loss conditions into video sequences extracted from considered online services. In [6] authors found average duration of videos hosted in Daum Concerning viewing conditions, all sequences were displayed in a mobile handset (screen size of 2.8 inches, resolution of 320*240 pixels) instead of a normalised LCD display, and users were asked to hold the handset on their hands with a free viewing distance (commonly 6-8 times the height of the display). We decided not to use the recommended continuous assessment method for long video sequences, since quality evaluation tasks may distort the results from a service perspective. In addition to quantitative assessments, qualitative evaluations were considered allowing users to add comments and to stop the play out if quality was perceived as unacceptable
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