Energy Minimization of Portable Video Communication Devices Based on Power-Rate-Distortion Optimization
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. 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.
Citation
Zhihai He, Wenye Chen, and Xi Chen, “Extending the operational lifetime of portable video communication devices using power-rate-distortion optimization” IEEE Transactions on Circuits and System for Video Technology, Vol. 18, No. 5, pp. 596-608, April 2008.
Rights
OpenAccess.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.