Piecewise spectrally band-pass for compressive coded aperture spectral imaging

doi:10.1088/1674-1056/24/8/080703

中国物理B ›› 2015, Vol. 24 ›› Issue (8): 80703-080703.doi: 10.1088/1674-1056/24/8/080703

Piecewise spectrally band-pass for compressive coded aperture spectral imaging

钱路路, 吕群波, 黄旻, 相里斌

Key Laboratory of Computational Optical Imaging Technology, Academy of Opto-electronics, Chinese Academy of Sciences, Beijing 100094, China

收稿日期:2015-01-26 修回日期:2015-03-23 出版日期:2015-08-05 发布日期:2015-08-05
基金资助:
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).

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

Received:2015-01-26 Revised:2015-03-23 Online:2015-08-05 Published:2015-08-05
Contact: Xiang Li-Bin E-mail:xiangli@aoe.ac.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: coded aperture, spectral imaging, compressive sensing, information reconstruction

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.

Key words: coded aperture, spectral imaging, compressive sensing, information reconstruction

中图分类号: (Optical instruments and equipment)

07.60.-j

42.30.Wb (Image reconstruction; tomography) 29.30.-h (Spectrometers and spectroscopic techniques)

钱路路, 吕群波, 黄旻, 相里斌. Piecewise spectrally band-pass for compressive coded aperture spectral imaging[J]. 中国物理B, 2015, 24(8): 80703-080703.

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[J]. Chin. Phys. B, 2015, 24(8): 80703-080703.

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Piecewise spectrally band-pass for compressive coded aperture spectral imaging

Piecewise spectrally band-pass for compressive coded aperture spectral imaging

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