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Conference proceedings on Applications, technologies, architectures, and protocols for computer communications
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Measuring perceived quality of speech and video in multimedia conferencing applications
MULTIMEDIA '98 Proceedings of the sixth ACM international conference on Multimedia
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MULTIMEDIA '99 Proceedings of the seventh ACM international conference on Multimedia (Part 1)
User-perceived quality-aware adaptive delivery of MPEG-4 content
NOSSDAV '03 Proceedings of the 13th international workshop on Network and operating systems support for digital audio and video
Automatic Identification of Perceptually Important Regions in an Image
ICPR '98 Proceedings of the 14th International Conference on Pattern Recognition-Volume 1 - Volume 1
Content-adaptive utility-based video adaptation
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 3 (ICME '03) - Volume 03
On end-to-end architecture for transporting MPEG-4 video over the Internet
IEEE Transactions on Circuits and Systems for Video Technology
User perception model for wearable supervision systems
Mobility '07 Proceedings of the 4th international conference on mobile technology, applications, and systems and the 1st international symposium on Computer human interaction in mobile technology
Effect of TCP and UDP parameters on the quality of video streaming delivery over the internet
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Human Machine Interaction
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Most adaptive delivery mechanisms for streaming multimedia content do not explicitly consider user-perceived quality when making adaptation decisions. We show that an optimal adaptation trajectory (OAT) through the set of possible encodings exists, and that it indicates how to adapt encoding quality in response to changes in network conditions in order to maximise user-perceived quality. The OAT is related to the characteristics of the content, in terms of spatial and temporal complexity. We describe a method to automatically determine the OAT in response to the time-varying characteristics of the content. In this way, as the characteristics of the content change over time, the system can dynamically and intelligently adjust the adaptation process in order to maximise the user-perceived quality. The OAT can be used with any sender-based transmission adaptation policy. We demonstrate content-based adaptation using the OAT in a practical system using two different adaptation algorithms. Furthermore, we show how this form of adaptation can result in differing adaptation behaviour not only as a result of the dynamics of the content but also as a result of the adaptation algorithm being used. Finally, we show how increased feedback frequency does not necessarily improve the behaviour of the adaptation algorithm being used.