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The sweet spot: How people trade off size and definition on mobile devices

Knoche, HO; Sasse, MA; (2008) The sweet spot: How people trade off size and definition on mobile devices. In: MM '08 Proceedings of the 16th ACM international conference on Multimedia. (pp. 21 - 30). ACM Green open access

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Abstract

Mobile TV can deliver up-to-date content to users on the move. But it is currently unclear how to best adapt higher resolution TV content. In this paper, we describe a laboratory study with 35 participants who watched short clips of different content and shot types on a 200ppi PDA display at a resolution of either 120x90 or 168x128. Participants selected their preferred size and rated the acceptability of the visual experience. The preferred viewing ratio depended on the resolution and had to be at least 9.8H. The minimal angular resolution people required and which limited the up-scaling factor was 14 pixels per degree. Extreme long shots were best when depicted actors were at least 0.7° high. A second study researched the ecological validity of previous lab results by comparing them to results from the field. Image size yielded more value for users in the field than was apparent from lab results. In conclusion, current prediction models based on preferred viewing distances for TV and large displays do not predict viewing preferences on mobile devices. Our results will help to further the understanding of multimedia perception and service designers to deliver both economically viable and enjoyable experiences.

Type: Proceedings paper
Title: The sweet spot: How people trade off size and definition on mobile devices
Event: MM '08
ISBN-13: 9781605583037
Open access status: An open access version is available from UCL Discovery
DOI: 10.1145/1459359.1459363
Publisher version: http://dx.doi.org/10.1145/1459359.1459363
Language: English
Additional information: "© ACM 2008. This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in MM '08 Proceedings of the 16th ACM international conference on Multimedia, http://dx.doi.org/10.1145/1459359.1459363."
UCL classification: 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: http://discovery.ucl.ac.uk/id/eprint/20255
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