Principles of Digital Audio and Video
Principles of Digital Audio and Video
Empirical study of user perception behavior for mobile streaming
Proceedings of the tenth ACM international conference on Multimedia
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
Design requirements for mobile TV
Proceedings of the 7th international conference on Human computer interaction with mobile devices & services
Can small be beautiful?: assessing image resolution requirements for mobile TV
Proceedings of the 13th annual ACM international conference on Multimedia
A fast algorithm to find the region-of-interest in the compressed MPEG domain
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 1
Automatic scaling and cropping of videos for devices with limited screen resolution
MULTIMEDIA '06 Proceedings of the 14th annual ACM international conference on Multimedia
The sweet spot: how people trade off size and definition on mobile devices
MM '08 Proceedings of the 16th ACM international conference on Multimedia
A comprehensive view on user studies: survey and open issues for mobile TV
Proceedings of the seventh european conference on European interactive television conference
The big picture on small screens delivering acceptable video quality in mobile TV
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)
A system for retargeting of streaming video
ACM SIGGRAPH Asia 2009 papers
Proceedings of the international conference on Multimedia
Mobile Networks and Applications
Algorithm and VLSI architecture for real-time 1080p60 video retargeting
EGGH-HPG'12 Proceedings of the Fourth ACM SIGGRAPH / Eurographics conference on High-Performance Graphics
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The growing market of Mobile TV requires automated adaptation of standard TV footage to small size displays. Especially extreme long shots (XLS) depicting distant objects can spoil the user experience, e.g. in soccer content. Automated zooming schemes can improve the visual experience if the resulting footage meets user expectations in terms of the visual detail and quality but does not omit valuable context information. Current zooming schemes are ignorant of beneficial zoom ranges for a given target size when applied to standard definition TV footage. In two experiments 84 participants were able to switch between original and zoom enhanced soccer footage at three sizes - from 320x240 (QVGA) down to 176x144 (QCIF). Eye tracking and subjective ratings showed that zoom factors between 1.14 and 1.33 were preferred for all sizes. Interviews revealed that a zoom factor of 1.6 was too high for QVGA content due to low perceived video quality, but beneficial for QCIF size. The optimal zoom depended on the target display size. We include a function to compute the optimal zoom for XLS depending on the target device size. It can be applied in automatic content adaptation schemes and should stimulate further research on the requirements of different shot types in video coding.