Abstract

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.

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2012

2011

2010

D. A. Boas and A. K. Dunn, “Laser speckle contrast imaging in biomedical optics,” J. Biomed. Opt.15(1), 011109 (2010).
[CrossRef] [PubMed]

2008

2006

2003

D. A. Seehusen, M. M. Reeves, and D. A. Fomin, “Cerebrospinal fluid analysis,” Am. Fam. Physician68(6), 1103–1108 (2003).
[PubMed]

2002

2000

1975

J. D. Briers, “A note on the statistics of laser speckle patterns added to coherent and incoherent uniform background fields, and a possible application for the case of incoherent addition,” Opt. Quantum Electron.7(5), 422–424 (1975).
[CrossRef]

Boas, D. A.

D. A. Boas and A. K. Dunn, “Laser speckle contrast imaging in biomedical optics,” J. Biomed. Opt.15(1), 011109 (2010).
[CrossRef] [PubMed]

Briers, J. D.

J. D. Briers, “A note on the statistics of laser speckle patterns added to coherent and incoherent uniform background fields, and a possible application for the case of incoherent addition,” Opt. Quantum Electron.7(5), 422–424 (1975).
[CrossRef]

Choi, B.

Duncan, D. D.

Dunn, A. K.

D. A. Boas and A. K. Dunn, “Laser speckle contrast imaging in biomedical optics,” J. Biomed. Opt.15(1), 011109 (2010).
[CrossRef] [PubMed]

Dunsby, C.

Eckersley, R.

Elson, D. S.

Fomin, D. A.

D. A. Seehusen, M. M. Reeves, and D. A. Fomin, “Cerebrospinal fluid analysis,” Am. Fam. Physician68(6), 1103–1108 (2003).
[PubMed]

Gunadi, S.

T. S. Leung and S. Gunadi, “The sensitivity of acousto-optic sensing measurements to absorption changes in superficial and deep layers,” Proc. SPIE8223, 822326 (2012).
[CrossRef]

S. Gunadi and T. S. Leung, “Spatial sensitivity of acousto-optic and optical near-infrared spectroscopy sensing measurements,” J. Biomed. Opt.16(12), 127005 (2011).
[CrossRef] [PubMed]

Jiang, S.

Kirkpatrick, S. J.

Ku, G.

Kulesz-Martin, M.

Lee, K.

Leung, T. S.

T. S. Leung and S. Gunadi, “The sensitivity of acousto-optic sensing measurements to absorption changes in superficial and deep layers,” Proc. SPIE8223, 822326 (2012).
[CrossRef]

T. S. Leung and S. Jiang, “Measuring the reflectance of hidden color objects with acoustically modulated laser speckle,” Opt. Lett.37(19), 4092–4094 (2012).
[CrossRef] [PubMed]

S. Gunadi and T. S. Leung, “Spatial sensitivity of acousto-optic and optical near-infrared spectroscopy sensing measurements,” J. Biomed. Opt.16(12), 127005 (2011).
[CrossRef] [PubMed]

Lévêque-Fort, S.

Li, J.

Li, R.

Reeves, M. M.

D. A. Seehusen, M. M. Reeves, and D. A. Fomin, “Cerebrospinal fluid analysis,” Am. Fam. Physician68(6), 1103–1108 (2003).
[PubMed]

Seehusen, D. A.

D. A. Seehusen, M. M. Reeves, and D. A. Fomin, “Cerebrospinal fluid analysis,” Am. Fam. Physician68(6), 1103–1108 (2003).
[PubMed]

Tang, M. X.

Wang, L. V.

Wang, R. K.

Wells-Gray, E. M.

Yang, O.

Am. Fam. Physician

D. A. Seehusen, M. M. Reeves, and D. A. Fomin, “Cerebrospinal fluid analysis,” Am. Fam. Physician68(6), 1103–1108 (2003).
[PubMed]

Appl. Opt.

J. Biomed. Opt.

D. A. Boas and A. K. Dunn, “Laser speckle contrast imaging in biomedical optics,” J. Biomed. Opt.15(1), 011109 (2010).
[CrossRef] [PubMed]

S. Gunadi and T. S. Leung, “Spatial sensitivity of acousto-optic and optical near-infrared spectroscopy sensing measurements,” J. Biomed. Opt.16(12), 127005 (2011).
[CrossRef] [PubMed]

Opt. Express

Opt. Lett.

Opt. Quantum Electron.

J. D. Briers, “A note on the statistics of laser speckle patterns added to coherent and incoherent uniform background fields, and a possible application for the case of incoherent addition,” Opt. Quantum Electron.7(5), 422–424 (1975).
[CrossRef]

Proc. SPIE

T. S. Leung and S. Gunadi, “The sensitivity of acousto-optic sensing measurements to absorption changes in superficial and deep layers,” Proc. SPIE8223, 822326 (2012).
[CrossRef]

Other

J. Li, “Ultrasound-Modulated Optical Tomography for Biomedical Applications,” (Texas A&M University, 2004).

R. O. Duda, P. E. Hart, and D. G. Stork, Pattern Classification and Scene Analysis, 2nd ed. (Wiley-Interscience, 1995).

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