DocumentCode :
1073215
Title :
Energy Minimization of Portable Video Communication Devices Based on Power-Rate-Distortion Optimization
Author :
He, Zhihai ; Cheng, Wenye ; Chen, Xi
Author_Institution :
Univ. of Missouri, Columbia
Volume :
18
Issue :
5
fYear :
2008
fDate :
5/1/2008 12:00:00 AM
Firstpage :
596
Lastpage :
608
Abstract :
Portable video communication devices operate on batteries with limited energy supply. However, video compression is computationally intensive and energy-demanding. Therefore, one of the central challenging issues in portable video communication system design is to minimize the energy consumption of video encoding so as to prolong the operational lifetime of portable video devices. In this work, based on power-rate-distortion (P-R-D) optimization, we develop a new approach for energy minimization by exploring the energy tradeoff between video encoding and wireless communication and exploiting the nonstationary characteristics of input video data. Both analytically and experimentally, we demonstrate that incorporating the third dimension of power consumption into conventional R-D analysis gives us one extra dimension of flexibility in resource allocation and allows us to achieve significant energy saving. Within the P-R-D analysis framework, power is tightly coupled with rate, enabling us to trade bits for joules and perform energy minimization through optimum bit allocation. We analyze the energy saving gain of P-R-D optimization. We develop an adaptive scheme to estimate P-R-D model parameters and perform online resource allocation and energy optimization for real-time video encoding. Our experimental studies show that, for typical videos with nonstationary scene statistics, using the proposed P-R-D optimization technology, the energy consumption of video encoding can be significantly reduced (by up to 50%), especially in delay-tolerant portable video communication applications.
Keywords :
data compression; minimisation; rate distortion theory; resource allocation; video coding; video equipment; P-R-D analysis; energy minimization; portable video communication device; power-rate-distortion optimization; resource allocation; video compression; video encoding; wireless communication; Lifetime maximization; lifetime maximization; power consumption; rate-distortion; rate-distortion (R-D); resource allocation; video compression;
fLanguage :
English
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8215
Type :
jour
DOI :
10.1109/TCSVT.2008.918802
Filename :
4454235
Link To Document :
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