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Piecewise spectrally band-pass for compressive coded aperture spectral imaging |
Qian Lu-Lu (钱路路), Lü Qun-Bo (吕群波), Huang Min (黄旻), Xiang Li-Bin (相里斌) |
Key Laboratory of Computational Optical Imaging Technology, Academy of Opto-electronics, Chinese Academy of Sciences, Beijing 100094, China |
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Abstract Coded aperture snapshot spectral imaging (CASSI) has been discussed in recent years. It has the remarkable advantages of high optical throughput, snapshot imaging, etc. The entire spatial-spectral data-cube can be reconstructed with just a single two-dimensional (2D) compressive sensing measurement. On the other hand, for less spectrally sparse scenes, the insufficiency of sparse sampling and aliasing in spatial-spectral images reduce the accuracy of reconstructed three-dimensional (3D) spectral cube. To solve this problem, this paper extends the improved CASSI. A band-pass filter array is mounted on the coded mask, and then the first image plane is divided into some continuous spectral sub-band areas. The entire 3D spectral cube could be captured by the relative movement between the object and the instrument. The principle analysis and imaging simulation are presented. Compared with peak signal-to-noise ratio (PSNR) and the information entropy of the reconstructed images at different numbers of spectral sub-band areas, the reconstructed 3D spectral cube reveals an observable improvement in the reconstruction fidelity, with an increase in the number of the sub-bands and a simultaneous decrease in the number of spectral channels of each sub-band.
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Received: 26 January 2015
Revised: 23 March 2015
Accepted manuscript online:
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PACS:
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07.60.-j
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(Optical instruments and equipment)
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42.30.Wb
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(Image reconstruction; tomography)
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29.30.-h
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(Spectrometers and spectroscopic techniques)
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Fund: Project supported by the National Natural Science Foundation for Distinguished Young Scholars of China (Grant No. 61225024) and the National High Technology Research and Development Program of China (Grant No. 2011AA7012022). |
Corresponding Authors:
Xiang Li-Bin
E-mail: xiangli@aoe.ac.cn
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Cite this article:
Qian Lu-Lu (钱路路), Lü Qun-Bo (吕群波), Huang Min (黄旻), Xiang Li-Bin (相里斌) Piecewise spectrally band-pass for compressive coded aperture spectral imaging 2015 Chin. Phys. B 24 080703
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