激光与光电子学进展, 2016, 53 (5): 053007, 网络出版: 2016-05-05   

基于光场成像的画幅式多光谱成像方法 下载: 550次

Frame Multispectral Imaging Based on Light Field Imaging
作者单位
1 南京理工大学电子工程与光电技术学院, 江苏 南京 210094
2 浙江大学光电科学与工程学院现代光学仪器国家重点实验室, 浙江 杭州 310027
摘要
画幅式多光谱成像技术能够同时获取多波段光谱图像数据,在材料分析及环境监控等领域有广泛应用。采用一种基于光场成像的画幅式多光谱成像方法,利用二次成像的方法将由光场成像系统获取的多光谱图像转接成像到探测器光敏面,不需微透镜阵列与探测器光敏面直接接触,避免了对探测器的损坏,同时降低了系统安装调节的难度。此外,研究了不同通道光谱信息混叠的影响因素,采用像素灰度匹配的方法获取各通道像点的矢量坐标,实现光谱通道信息的提取。在不同光强条件下对灰度进行平场校正,获取各光谱通道的归一化通光率,用以校正通道灰度误差。搭建了实验装置,对室内目标进行多光谱瞬时探测,获取了较为清晰的多光谱图像。
Abstract
Frame multispectral imaging technology is capable to acquire multi-band spectral images simultaneously, and has been widely used in many fields such as material analysis, environment monitoring and so on. A frame multispectral imaging method based on light field imaging technology is employed, and a secondary imaging system is designed to reimage the multispectral image obtained by the light field imaging system onto the photosensitive surface of detector. It is able to avoid the damage of detector caused by the direct contact between the microlens array and the photosensitive surface, and decrease the difficulty of adjustment and installation for the system as well. In addition, the factors that cause channel spectra aliasing are discussed. Based on the pixel gray matching method, the vector coordinates of each channel points are extracted and the spectral channel information is obtained. Besides, a series of plane calibrations under different light intensities are operated to get the normalized light throughput of every channel for calibrating the gray errors of the system. Eventually, an experimental system is set up, the multi-spectral instantaneous detection to indoor target is realized, and the clear recovered spectral images are obtained.

沈燕, 张磊, 柏财勋, 孟鑫, 李建欣. 基于光场成像的画幅式多光谱成像方法[J]. 激光与光电子学进展, 2016, 53(5): 053007. Shen Yan, Zhang Lei, Bai Caixun, Meng Xin, Li Jianxin. Frame Multispectral Imaging Based on Light Field Imaging[J]. Laser & Optoelectronics Progress, 2016, 53(5): 053007.

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