Principles of Digital Audio and Video
Principles of Digital Audio and Video
Why Value Is Everything: A User-Centered Approach to Internet Quality of Service and Pricing
IWQoS '01 Proceedings of the 9th International Workshop on Quality of Service
Sharp or smooth?: comparing the effects of quantization vs. frame rate for streamed video
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Personal and Ubiquitous Computing
Can small be beautiful?: assessing image resolution requirements for mobile TV
Proceedings of the 13th annual ACM international conference on Multimedia
Reading the fine print: the effect of text legibility on perceived video quality in mobile tv
MULTIMEDIA '06 Proceedings of the 14th annual ACM international conference on Multimedia
The kindest cut: enhancing the user experience of mobile tv through adequate zooming
Proceedings of the 15th international conference on Multimedia
Does context matter in quality evaluation of mobile television?
Proceedings of the 10th international conference on Human computer interaction with mobile devices and services
A comprehensive view on user studies: survey and open issues for mobile TV
Proceedings of the seventh european conference on European interactive television conference
Fine-grained scalable streaming from coarse-grained videos
Proceedings of the 18th international workshop on Network and operating systems support for digital audio and video
MM '09 Proceedings of the 17th ACM international conference on Multimedia
Context saliency based image summarization
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
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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.