Abstract

During the past decade, optical imaging through scattering medium has proved to be a powerful technique for many applications. It is especially effective in medical diagnostic, since it is safe, noninvasive and low-cost compared with the conventional radiation techniques. Based on a similar principle of the fly’s visual system, we show a novel method of optical imaging through scattering medium. An image of bones hidden between two biological tissues (chicken breast) is recovered from many noisy speckle pictures obtained on the output of a multi-channeled optical imaging system. The operation of multiple imaging is achieved using a microlens array. Each lens from the array projects a different speckled image on a digital camera. The set of speckled images from the entire array are first shifted to a common center and then accumulated to a single average picture in which the concealed object is exposed.

© 2003 Optical Society of America

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References

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Appl. Opt.

IEEE J. Quantum Electron.

W.-F. Cheong, S. A. Prahl, and A. J. Welch, �??A review of the optical properties of biological tissues,�?? IEEE J. Quantum Electron. 26, 2166-2185 (1990).
[CrossRef]

Opt. Lett.

Phys. Med. Biol.

J. C. Hebden, S. R. Arridge and D. T. Delpy, �??Optical imaging in medicine: I. Experimental techniques,�?? Phys. Med. Biol. 42, 825-840 (1997).
[CrossRef] [PubMed]

Other

J. W. Goodman, Introduction to Fourier Optics, 2nd ed. (McGraw-Hill, New York, 1996), 126-130.

T. Vo-Dinh ed., Biomedical Photonics Handbook (CRC Press, Boca Raton 2003), 21-8.

R. Dawkins, Climbing Mount Improbable (W. W. Norton & Co., 1996), 138-197.

M. F. Land, and D.-E. Nilsson, Animal Eyes (Oxford Univ. Press, New York, 2002), 125-155.

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Figures (5)

Fig. 1.
Fig. 1.

Setup of the NOISE system.

Fig. 2.
Fig. 2.

The average picture of the entire array when the cross-junction of chicken bones is positioned in front of layer S1 and the layer S2 is removed.

Fig. 3.
Fig. 3.

12×11 blurred images recorded by the CCD when the cross-junction sign is embedded between the two scattering layers.

Fig. 4.
Fig. 4.

The process of recovering the hidden object by adding more and more pictures from the array of 132 pictures shown in Fig. 3.

Fig. 5.
Fig. 5.

Average Mean Square Error versus the number of additions, where N goes from 1 to 132. Blue line - MSE between the final image and the images obtained from N additions. Red line - MSE between the images of Fig. 2 and the image obtained from N additions.

Equations (4)

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I ( r o ) = t ( r o ) h o ( r o ) 2
1 K k h k ( r ) h o ( r ) .
S ( r o ) = 1 K k t ( r o ) h k ( r o ) 2
S ( r o ) t ( r o ) h o ( r o ) 2 + t ( r o ) 2 σ 2 ( r o )

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