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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 20197–20209

Classifying hidden colors behind an opaque layer with the acoustically modulated laser speckle contrast technique

Terence S. Leung and Shihong Jiang  »View Author Affiliations

Optics Express, Vol. 21, Issue 17, pp. 20197-20209 (2013)

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The acoustically modulated laser speckle contrast technique has been employed to quantify and classify 25 colors (made up by different percentages of the two base colors cyan and magenta) hidden behind a 5 mm thick opaque layer with 0.24% transmittance. The main components included two He-Ne lasers (543 and 633 nm), a consumer grade digital camera (Nikon 1 J1), focusing optics and a loudspeaker. The camera captured the laser speckle patterns with the sound on and off, respectively, from which the speckle contrast differences were calculated and used in a nearest neighbor classification algorithm. The classification accuracy was between 55% and 88% depending on the underlying reflectance of all the colors to be classified.

© 2013 OSA

OCIS Codes
(300.6480) Spectroscopy : Spectroscopy, speckle
(170.1065) Medical optics and biotechnology : Acousto-optics
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: July 10, 2013
Revised Manuscript: August 15, 2013
Manuscript Accepted: August 15, 2013
Published: August 20, 2013

Virtual Issues
Vol. 8, Iss. 9 Virtual Journal for Biomedical Optics

Terence S. Leung and Shihong Jiang, "Classifying hidden colors behind an opaque layer with the acoustically modulated laser speckle contrast technique," Opt. Express 21, 20197-20209 (2013)

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