Inexact floating-point adder for dynamic image processing

Weiqiang Liu*, Linbin Chen, Chenghua Wang, Máire O'Neill, Fabrizio Lombardi

*Corresponding author for this work

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

11 Citations (Scopus)


Power has become a key constraint in current nanoscale integrated circuit design due to the increasing demands for mobile computing and a low carbon economy. As an emerging technology, an inexact circuit design offers a promising approach to significantly reduce both dynamic and static power dissipation for error tolerant applications. Although fixed-point arithmetic circuits have been studied in terms of inexact computing, floating-point arithmetic circuits have not been fully considered although require more power. In this paper, the first inexact floating-point adder is designed and applied to high dynamic range (HDR) image processing. Inexact floating-point adders are proposed by approximately designing an exponent subtractor and mantissa adder. Related logic operations including normalization and rounding modules are also considered in terms of inexact computing. Two HDR images are processed using the proposed inexact floating-point adders to show the validity of the inexact design. HDR-VDP is used as a metric to measure the subjective results of the image addition. Significant improvements have been achieved in terms of area, delay and power consumption. Comparison results show that the proposed inexact floating-point adders can improve power consumption and the power-delay product by 29.98% and 39.60%, respectively.

Original languageEnglish
Title of host publication14th IEEE International Conference on Nanotechnology, IEEE-NANO 2014
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Electronic)9781479956227
ISBN (Print)9781479956227
Publication statusPublished - 26 Nov 2014
Event2014 14th IEEE International Conference on Nanotechnology, IEEE-NANO 2014 - Toronto, Canada
Duration: 18 Aug 201421 Aug 2014


Conference2014 14th IEEE International Conference on Nanotechnology, IEEE-NANO 2014


  • Floating-point adders
  • High-dynamic range image
  • Inexact computing
  • Low power

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Modelling and Simulation
  • Instrumentation


Dive into the research topics of 'Inexact floating-point adder for dynamic image processing'. Together they form a unique fingerprint.

Cite this