光学学报, 2020, 40 (1): 0111026, 网络出版: 2020-01-06
电子式多狭缝组合编码高光谱成像系统 下载: 1475次
Hyperspectral Imaging System Using Electronic Multi-Slot Combination Coding
成像系统 计算成像 压缩感知 高光谱成像 编码孔径 imaging systems computational imaging compressive sensing hyperspectral imaging coded aperture
摘要
编码孔径光谱成像系统利用空间光调制器对目标信息进行编码,将信号映射到二维探测器面阵上,形成空间和光谱混叠信息,通过重构算法恢复出光谱数据立方体。由于该系统的色散仅仅发生在水平方向上,为了提高编码的效率,提出只在一个方向上具有编码效果的多狭缝组合编码。与目前采用的二维随机编码比较,在取得相同重构结果的前提下,多狭缝组合编码形式简化了数学模型的建立和分析,降低了编码复杂度。在此基础上,利用液晶光阀的开关特性实现实际系统编码,结合PGP(棱镜-透射光栅-棱镜)分光组件搭建光谱成像系统,进行了不同采样率下的实验,得到了高精度的恢复结果,验证了系统编码的可行性,为编码光谱成像系统领域提供了新思路。
Abstract
A coded aperture spectral imaging system uses a spatial light modulator to encode target information. It subsequently maps the signal onto a two-dimensional detector array and forms spatial and spectral aliasing information. Further, a spectral data cube can be reconstructed using a suitable reconstruction algorithm. In this study, we propose a multi-slot combination coding method, which is encoded in only one direction, to improve the coding efficiency. This procedure is selected because dispersion occurs in only one direction. When compared with the two-dimensional random coding method that is currently being applied, this approach simplifies the mathematical model and its analysis while reducing the coding complexity,under the premise of obtaining identical reconstruction results. Further, the switching characteristics of the liquid crystal light valve are used in the coding. The spectral imaging system is assembled by incorporating a PGP (prism-transmission grating-prism) beam-splitting component. Different sampling rate experiments are conducted, and highly accurate recovery results are obtained. The feasibility of the proposed coding method can result in innovation in the future coded spectral imaging systems.
刘世界, 李春来, 徐睿, 唐国良, 王建宇. 电子式多狭缝组合编码高光谱成像系统[J]. 光学学报, 2020, 40(1): 0111026. Shijie Liu, Chunlai Li, Rui Xu, Guoliang Tang, Jianyu Wang. Hyperspectral Imaging System Using Electronic Multi-Slot Combination Coding[J]. Acta Optica Sinica, 2020, 40(1): 0111026.