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Breaking the News on Mobile TV: User requirements of a popular mobile content

Knoche, HO; Sasse, MA; (2006) Breaking the News on Mobile TV: User requirements of a popular mobile content. In: Creutzburg, R and Takala, JH and Chen, CW, (eds.) Proceedings of SPIE. SPIE Green open access

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Abstract

This paper presents the results from three lab-based studies that investigated different ways of delivering Mobile TV News by measuring user responses to different encoding bitrates, Image resolutions and text quality. All studies were carried out with participants watching News content on mobile devices, with a total of 216 participants rating the acceptability of the viewing experience. Study 1 compared the acceptability of a 15-second video clip at different video and audio encoding bit rates on a 3G phone at a resolution of 176x144 and an iPAQ PDA (240x180). Study 2 measured the acceptability of video quality of full feature news clips of 2.5 minutes which were recorded from broadcast TV, encoded at resolutions ranging from 120x90 to 240x180, and combined with different encoding bit rates and audio qualities presented on an iPAQ. Study 3 improved the legibility of the text included in the video simulating a separate text delivery.The acceptability of News' video quality was greatly reduced at a resolution of 12000. The legibility of text was a decisive factor in the participants' assessment of the video quality. Resolutions of 168x126 and higher were substantially more acceptable when they were accompanied by optimized high quality text compared to proportionally scaled inline text. When accompanied by high quality text TV news clips were acceptable to the vast majority of participants at resolutions as small as 168x126 for video encoding bitrates of 160kbps and higher. Service designers and operators can apply this knowledge to design a cost-effective mobile TV experience.

Type: Proceedings paper
Title: Breaking the News on Mobile TV: User requirements of a popular mobile content
Event: Conference on Multimedia on Mobile Devices II
Location: San Jose, CA
Dates: 2006-01-16 - 2006-01-17
ISBN: 0819461148
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.655950
Publisher version: http://dx.doi.org/10.1117/12.655950
Language: English
Additional information: Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Keywords: Mobile TV, mobile devices, mobile multimedia, video quality, audio quality, image resolution, image size, text in video
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
URI: https://discovery.ucl.ac.uk/id/eprint/119019
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