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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 23 — Nov. 18, 2013
  • pp: 28902–28913

Correcting speckle contrast at small speckle size to enhance signal to noise ratio for laser speckle contrast imaging

Jianjun Qiu, Yangyang Li, Qin Huang, Yang Wang, and Pengcheng Li  »View Author Affiliations

Optics Express, Vol. 21, Issue 23, pp. 28902-28913 (2013)

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In laser speckle contrast imaging, it was usually suggested that speckle size should exceed two camera pixels to eliminate the spatial averaging effect. In this work, we show the benefit of enhancing signal to noise ratio by correcting the speckle contrast at small speckle size. Through simulations and experiments, we demonstrated that local speckle contrast, even at speckle size much smaller than one pixel size, can be corrected through dividing the original speckle contrast by the static speckle contrast. Moreover, we show a 50% higher signal to noise ratio of the speckle contrast image at speckle size below 0.5 pixel size than that at speckle size of two pixels. These results indicate the possibility of selecting a relatively large aperture to simultaneously ensure sufficient light intensity and high accuracy and signal to noise ratio, making the laser speckle contrast imaging more flexible.

© 2013 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(030.6600) Coherence and statistical optics : Statistical optics
(110.6150) Imaging systems : Speckle imaging
(170.3880) Medical optics and biotechnology : Medical and biological imaging

ToC Category:
Coherence and Statistical Optics

Original Manuscript: September 20, 2013
Revised Manuscript: November 9, 2013
Manuscript Accepted: November 11, 2013
Published: November 15, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Jianjun Qiu, Yangyang Li, Qin Huang, Yang Wang, and Pengcheng Li, "Correcting speckle contrast at small speckle size to enhance signal to noise ratio for laser speckle contrast imaging," Opt. Express 21, 28902-28913 (2013)

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