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Multispectral imaging using compact compound optics

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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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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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