余弦编码复用多光谱关联成像技术研究  

Cosinusoidal Encoding Multiplexed Multispectral Ghost Imaging

作　　者：孙宇松 黄见 时东锋 苑克娥 胡顺星 王英俭[1,2,3] Sun Yusong;Huang Jian;Shi Dongfeng;Yuan Ke e;Hu Shunxing;Wang Yingjian(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Hefei Institures of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,Anhui,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230026 [3]先进激光技术安徽省实验室,安徽合肥230037

出　　处：《中国激光》2023年第13期235-244,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(U20A20214);中国科学院青年创新促进会项目(2020438);中国科学院科技创新重点实验室基金(CXJJ-20S028);安徽省先进激光技术实验室开放项目(AHL2021ZR01)。

摘　　要：传统多光谱关联成像技术的发展受限于系统结构复杂和数据量大。为提高多光谱图像的复原效率,本文提出了余弦编码复用多光谱关联成像技术。将具有确定频率的余弦结构编码与正交Hadamard基图案复用为结构光对目标场景进行调制照明,并用一个宽带光电倍增管收集后向散射信号。在复原过程中,基于余弦编码的傅里叶频移特性可将多通道光谱混叠信息由空间域转换到频率域进行解码分离,最终复原出目标场景的多光谱图像。通过仿真分析了理想低通滤波器、高斯低通滤波器和巴特沃斯低通滤波器对多光谱图像复原质量的影响,并将所提方法与传统方法进行了对比实验。结果表明:所提方法能有效提高多光谱信息的获取效率,缩短图像重建时间;频域滤波时,选用高斯低通滤波器比理想低通滤波器、巴特沃斯低通滤波器更具优势。Objective Multispectral ghost imaging is a perfect combination of spectral and ghost imaging.Compared to single-band ghost imaging,multispectral ghost imaging provides richer information,which may improve the accuracy and reliability of object recognition,material analysis,and medical diagnosis.Traditional multispectral ghost imaging is accomplished by employing multiple detectors or time-divided detection via filter wheeling to capture images of various spectral channels and combine them into a color image.These strategies have limitations,such as complex structures,and require a large amount of data.Alternatively,by encoding and decoding in the projection and recovery stages,respectively,multispectral multiplexed ghost imaging can obtain the multispectral information of objects in one projection cycle.However,there are still some problems in existing multispectral multiplexed ghost imaging,such as requiring a compressed sensing algorithm in the restoration phase,significantly increasing time consumption.In this study,we propose cosinusoidal encoding multiplexed multispectral ghost imaging,which can effectively improve the imaging efficiency of multispectral ghost imaging while ensuring high-quality imaging through a simple and flexible encoding strategy.Methods The process of cosinusoidal encoding multiplexed multispectral ghost imaging is divided into three steps.First,Hadamard basis patterns and cosinusoidal encoding matrices are combined to generate colored illumination patterns.The second step is similar to traditional ghost imaging;the constructed colored patterns are used to illuminate the target object,and a single-pixel detector is used to collect the reflection signal of the object.Subsequently,the conventional linear algorithm was used to obtain a composite grayscale image.The third step involved reconstructing the multispectral image.During this phase,a composite grayscale image of the object is converted to Fourier space for recombining the information of each channel.Further,the spectral informatio

关 键 词：成像系统 关联成像 编码复用 多光谱成像 低通滤波器 

分 类 号：O436[机械工程—光学工程]