Abstract

A very thin image capturing system called TOMBO (thin observation module by bound optics) is developed with compound-eye imaging and digital post-processing. As an application of TOMBO, a multispectral imaging system is proposed. With a specific arrangement of the optical system, spatial points can be observed by multiple photodetectors simultaneously. A filter array inserted in front of the image sensor enables observation of the spectrum of the target. The captured image is reconstructed by a modified pixel rearranging method extended to treat multi-channel spectral data, in which pixels in the captured image are geometrically rearranged onto a multi-channel virtual image plane. Experimental results of the image reconstruction show the effectiveness of the proposed system.

© 2004 Optical Society of America

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References

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    [CrossRef]

Appl. Opt.

CVGIP: Graphical Models and Image Proc.

M. Irani and S. Peleg, �??Improving resolution by image registration,�?? CVGIP: Graphical Models and Image Processing 53, 231�??239 (1991).
[CrossRef]

IEEE Trans. Sys., Man, and Cybernetics

Nobuyuki Otsu, �??A Threshold Selection Method from Gray-Level Histograms,�?? IEEE Trans. Sys., Man, and Cybernetics SMC-9, No.1, 62�??66 (1979).

Opt. Express

Proc. of International Symposium

Masahiro Nishibori, �??The Role of Multispectral Imaging in Medicine,�?? in Proc. of International Symposium on Multispectral Imaging and Color Representation for Digital Archives (1999), pp. 114�??116.

Proc. SPIE

M. Yamaguchi, T. Teraji, K. Ohsawa, T. Uchiyama, H. Motomura, Y. Murakami, and N. Ohyama, �??Color image reproduction based on the multispectral and multiprimary imaging: Experimental evaluation,�?? Color Imaging: Device-Independent Color, Color Hardcopy, and Applications VII, Proc. SPIE 4663, 15�??26 (2002).

J. Tanida, Y. Kitamura, K. Yamada, S. Miyatake, M. Miyamoto, T. Morimoto, Y. Masaki, N. Kondou, D. Miyazaki and Y. Ichioka, �??Compact image capturing system based on compound imaging and digital reconstruction,�?? Micro- and Nano-optics for Optical Interconnection and Information Processing, Proc. SPIE 4455, 34�??41 (2001).
[CrossRef]

Other

W. Ford and M.S. Baum, Secure Electronic Commerce: Building the Infrastructure for Digital Signatures and Encryption (Prentice Hall Inc., Upper Saddle River, NJ, 2001).

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Figures (11)

Fig. 1.
Fig. 1.

Schematic diagram of the TOMBO architecture.

Fig. 2.
Fig. 2.

Schematic diagram of the TOMBO optical setup.

Fig. 3.
Fig. 3.

TOMBO system with different interference filter on each unit.

Fig. 4.
Fig. 4.

Schematic diagram of multispectral image capturing.

Fig. 5.
Fig. 5.

Distribution of points observed at the object planes by the photodetectors.

Fig. 6.
Fig. 6.

Flow of the reconstruction processing.

Fig. 7.
Fig. 7.

Photograph of prototype multispectral TOMBO system.

Fig. 8.
Fig. 8.

Filter characteristics.

Fig. 9.
Fig. 9.

Experimental results from multispectral imaging using prototype TOMBO system.

Fig. 10.
Fig. 10.

Spectrum to RGB converted image.

Fig. 11.
Fig. 11.

Experimental results.

Tables (1)

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Table 1. Centroid for target chart and wavelengths

Equations (5)

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M p = l N ,
d unif = l f N p ,
c ' ( x , y ) = c ( x , y ) b ( x , y ) w ( x , y ) b ( x , y ) ,
( G x G y ) = 1 T x y g ( x , y ) ( x y ) ,
T = x y g ( x , y )

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