MobiUS

MobiUS - MobiUS:EnableTogetherViewingVideo...

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1 MobiUS: Enable Together-Viewing Video  Experience across Two Mobile Devices Guobin Shen, Yanlin Li, Yongguang Zhang Microsoft Research Asia
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2 Contents Introduction Collaborative Half-frame Decoding System Architecture and Implementation Experimental Results and Evaluation Discussion and conclusion
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3 Introduction Motivation: A new  better-together  mobile application paradigm when multiple mobile devices are placed together
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4 A specific  together-viewing  video application A higher resolution video is played back across screens of  two mobile devices placed side by side 
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5 Assumptions  One device has a higher resolution video whose size is  about twice of its screen size while the other not Two devices can communicate effectively and directly  via high-speed local wireless networks Two devices are homogeneous: same/similar software  and hardware capabilities
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6 Requirements Real-time synchronous playback At least 15 frames per second (fps) Same frame rendered at two screens simultaneously Energy efficiency Work in resource-constrained environment Limited processing power, memory, battery life … Dynamic adaption Expand the video on to two devices with another coming Shrink it on to one screen with another leaving
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7 Possible Solutions Full-frame Decoding-based Approaches: Thin client model Thick client model Half-frame Decoding-based Approaches: Whole-bitstream transmission (WTHD) Partial-bitstream transmission (PTHD)
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8 Thin Client Model Computation of  Mb  not utilized Huge bandwidth demand Unbalanced energy consumption Short operating lifetime Ma: Decode whole frame Mb Decoded right half-frame Display left half-frame Display right half-frame
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9 Thick Client Model Computation power of both devices utilized Less bandwidth requirement Balanced energy consumption Abuse more computation power than necessary Ma Mb Decode whole frame Display the left half-frame Decode whole frame Display the right half-frame Whole bitstream
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10 Whole-bitstream transmission (WTHD) Computation power of both devices utilized
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This note was uploaded on 01/16/2012 for the course ECE 256 taught by Professor Choudhury during the Spring '11 term at Duke.

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MobiUS - MobiUS:EnableTogetherViewingVideo...

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