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Semi-Dynamic Digital Video Adaptation System for Mobile Environment  

추진호 (서강대학교 컴퓨터학과)
이상민 (서강대학교 컴퓨터학과)
낭종호 (서강대학교 컴퓨터학과)
Publication Information
Journal of KIISE:Software and Applications / v.31, no.10, 2004 , pp. 1320-1331 More about this Journal
Abstract
A video adaptation system translates the source video stream into appropriate video stream while satisfying the network and client constraints and maximizing the video quality as much as possible. This paper proposes a semi-dynamic video adaptation scheme, in which several intermediate video streams and the information for the measuring of video quality are generated statically. The intermediate video streams are generated by reducing the resolution of the video stream by a power of two several times, and they are stored as the intermediate video streams on the video server. The statically generated information for the input video stream consists of the degrees of smoothness for each frame rate and the degree of frame definition for each pixel bit rate. It helps to dynamically generate the target video stream according to the client's QoS at run-time as quickly as possible. Experimental result shows that the proposed adaptation scheme can generate the target video stream about thirty times faster while keeping the quality degradation as less than 2% comparing to the target video stream that is totally dynamically generated, although the extra storages for the intermediate video streams are required.
Keywords
Video Adaptation; Video Analysis; Mobile Multiemdia;
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