Design methodology for low power and parametric robustness through output-quality modulation: Application to color-interpolation filtering

Nilanjan Banerjee, Georgios Karakonstantis, Jung Hwan Choi, Chaitali Chakrabarti, Kaushik Roy

Research output: Contribution to journalArticle

2 Scopus citations


Power dissipation and robustness to process variation have conflicting design requirements. Scaling of voltage is associated with larger variations, while Vdd upscaling or transistor upsizing for parametric-delay variation tolerance can be detrimental for power dissipation. However, for a class of signal-processing systems, effective tradeoff can be achieved between Vdd scaling, variation tolerance, and "output quality." In this paper, we develop a novel low-power variation-tolerant algorithm/architecture for color interpolation that allows a graceful degradation in the peak-signal-to-noise ratio (PSNR) under aggressive voltage scaling as well as extreme process variations. This feature is achieved by exploiting the fact that all computations used in interpolating the pixel values do not equally contribute to PSNR improvement. In the presence of Vdd scaling and process variations, the architecture ensures that only the "less important computations" are affected by delay failures. We also propose a different slidingwindow size than the conventional one to improve interpolation performance by a factor of two with negligible overhead. Simulation results show that, even at a scaled voltage of 77% of nominal value, our design provides reasonable image PSNR with 40% power savings.

Original languageEnglish (US)
Pages (from-to)1127-1137
Number of pages11
JournalIEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Issue number1
Publication statusPublished - Jan 2009



  • Color interpolation
  • Low-power design
  • Process variation tolerance
  • Quality-Vdd tradeoffs

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Software

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