Significance Driven Computation: A Voltage-Scalable, Variation-Aware, Quality-Tuning Motion Estimator

Debabrata Mohapatra*, Georgios Karakonstantis, Kaushik Roy

*Corresponding author for this work

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

86 Citations (Scopus)

Abstract

In this paper we present a design methodology for algorithm/architecture co-design of a voltage-scalable, process variation aware motion estimator based on significance driven computation. The fundamental premise of our approach lies in the fact that all computations are not equally significant in shaping the output response of video systems. We use a statistical technique to intelligently identify these significant/not-so-significant computations at the algorithmic level and subsequently change the underlying architecture such that the significant computations are computed in an error free manner under voltage over-scaling. Furthermore, our design includes an adaptive quality compensation (AQC) block which "tunes" the algorithm and architecture depending on the magnitude of voltage over-scaling and severity of process variations. Simulation results show average power savings of similar to 33% for the proposed architecture when compared to conventional implementation in the 90 nm CMOS technology. The maximum output quality loss in terms of Peak Signal to Noise Ratio (PSNR) was similar to 1 dB without incurring any throughput penalty.

Original languageEnglish
Title of host publicationISLPED 09
Place of PublicationNEW YORK
PublisherASSOC COMPUTING MACHINERY
Pages195-200
Number of pages6
ISBN (Print)978-1-60558-684-7
Publication statusPublished - 2009
Event14th International Symposium on Low Power Electronics and Design - San Francisco, Canada
Duration: 19 Aug 200921 Aug 2009

Conference

Conference14th International Symposium on Low Power Electronics and Design
Country/TerritoryCanada
Period19/08/200921/08/2009

Keywords

  • Significance driven computation
  • low power
  • motion estimation
  • variation aware
  • voltage over-scaling

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