Low energy motion estimation via selective aproximations

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This paper presents a novel sum of absolute difference (SAD) scheme that significantly reduces the energy consumption of the motion estimation kernel in video coders. The proposed scheme exploits the facts that most of the absolute difference (AD) calculations result in small values, and most of the large AD values do not contribute to the SAD values of the blocks that are selected. Thus the large AD values can be approximated, resulting in lower critical path delay and lower energy consumption of the SAD unit. In addition, the proposed scheme truncates one lower order bit and variants of this scheme implement sub-sampling to further reduce the energy consumption. Performance of the proposed technique is evaluated using the H.264 video encoding framework. Simulation results show 37.5% reduction in energy consumption at nominal voltage and 68% energy reduction for iso-throughput compared to the conventional implementation with only 0.06% drop in PSNR and 1.8% increase in compressed data rate. With an additional sub-sampling, the proposed scheme achieves 90% reduction in energy consumption with 0.6% reduction in PSNR and 6.5% increase in compressed data rate.

Original languageEnglish (US)
Title of host publicationProceedings - 22nd IEEE International Conference on Application-Specific Systems, Architectures and Processors, ASAP 2011
Pages176-183
Number of pages8
DOIs
StatePublished - Nov 3 2011
Event22nd IEEE International Conference on Application-Specific Systems, Architectures and Processors, ASAP 2011 - Santa Monica, CA, United States
Duration: Sep 11 2011Sep 14 2011

Publication series

NameProceedings of the International Conference on Application-Specific Systems, Architectures and Processors
ISSN (Print)1063-6862

Other

Other22nd IEEE International Conference on Application-Specific Systems, Architectures and Processors, ASAP 2011
CountryUnited States
CitySanta Monica, CA
Period9/11/119/14/11

Keywords

  • Error Resiliency
  • Low Energy Implementation
  • Motion Estimation

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Networks and Communications

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