Research On The Working Mode Of The Intensity-correlation Multispectral Imaging Camera

With the development of science and technology,people are no longer satisfied with just recording what can be observed by eyes,but instead they want to further get more hidden information of things.Multispectral imaging is a such kind of imaging technology that can present more information of things compared to traditional imaging,and it is an imaging technology that combines spectral analysis and image analysis.By obtaining the image information of the target object at different wavelengths,a three-dimensional image data which has both spectral and image information can be formed.The intensity-correlation multispectral imaging technology studied in this paper,which combines multispectral imaging technology,correlation imaging technology and compressed sensing theory,is a new type of spectral imaging mode.It has the advantages such as high energy utilization efficiency,fast information acquisition,and obtaining three-dimensional "data cube" information in a single shot.In this paper,based on the experimental platform built on the principle prototype of intensity-correlation multispectral imaging,study on the intensity-correlation multispectral imaging is performed,and the working mode of intensity-correlation multispectral imaging principle prototype is especially studied in detail.The details are as follows:(1)The correlation imaging technology,compressed sensing theory and intensity-correlation multispectral imaging technology are briefly introduced,and the current development status of correlation imaging technology,compressed sensing theory and intensity-correlation multispectral imaging technology are described in detail.(2)The basic concepts and principles of intensity-correlation multispectral imaging are summarized.Experimental platform and calibration system of the intensity-correlation multispectral imaging principle prototype are built.Field experiments are carried out using the experimental platform,which realize both staring type and push-broom type spectral imaging,and verify the ability of the principle prototype to image complex natural objects.(3)Experimental studies on both quasi-monochromatic intensity-correlation imaging and intensity correlation multispectral imaging are carried out.The joint iterative method based on Landweber regularization and guided filtering is applied to the field of multispectral imaging,and its effect on imaging quality is analyzed.The image reconstruction results of the TV＿rank and joint iterative methods are compared through numerical simulation,and the improvement range and change trend of the reconstruction quality under different sampling rate and signal-to-noise ratio are analyzed.The feasibility of applying the joint iterative method to multispectral imaging is verified.(4)Research on the working mode of intensity-correlation multispectral imaging is performed.In order to solve the problem of limited detection sensitivity caused by relative motion and the resulting reduction of signal-to-noise ratio,a push-broom mode intensity-correlation multispectral imaging scheme based on detection signal superposition is proposed.In this scheme,one set of spectral image can be obtained from one frame of detection signal,and multiple frames of detection signals are superposed according to the overlapping of the imaging fields of adjacent frames to improve the signal-to-noise ratio(SNR).Numerical simulation and experiments verify the effectiveness of the proposed scheme on enhance the SNR,especially when the detection signal is weak.