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A Video Encoding Scheme using Adaptive Spatial Resolution Control for Mobile Video Applications  

Lee, Hee-Jung (서울대학교 전기컴퓨터공학부 컴퓨터시스템 연구실)
Lee, Yong-Hee (서울대학교 전기컴퓨터공학부 컴퓨터시스템 연구실)
Lee, Jong-Hun (서울대학교 전기컴퓨터공학부 컴퓨터시스템 연구실)
Shin, Heon-Shik (서울대학교 전기컴퓨터공학부 컴퓨터시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.7C, 2009 , pp. 654-662 More about this Journal
Abstract
Video streams for mobile video streaming can be encoded to fit the available network bandwidth by controlling three factors: temporal resolution, spatial resolution, and picture quality. The controlling of picture quality by modifying the quantization parameter (QP) is most widely used. In this paper, we demonstrate that reducing the spatial resolution adaptively can be more efficient in terms of picture quality and energy consumption in low bit-rate environment, and present a model to find the optimal spatial resolution for the available bandwidth. Adaptive spatial resolution control scheme is especially effective when the bandwidth between the video server and the mobile device varies considerably with time, and when the mobile device is sensitive to energy consumption. Our scheme can improve the picture quality by approximately O.5dB and reduce energy consumption by more than 50% compared to the conventional video coding in low bit-rate environment.
Keywords
spatial resolution; wireless; video streaming; H.264/AVC;
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