Multi-spectral Information Acquisition Based On White Light Computing Ghost Imaging

Ghost imaging is a novel imaging technology.Different from conventional imaging techniques,in ghost imaging systems,the spatial information of the target object can be obtained by performing a series of intensity correlation measurements between the intensity information which is acquired by the detectors on the two different optical paths.In the few decades,it gradually become a focus of study due to its simple system structure,high resolution and strong robustness to noise.Colorized images are superior to grayscale images in both image quality and eye recognition,compare with conventional mono-wavelength ghost imaging,the spectral information of the object can be reconstructed by multi-wavelength ghost imaging.Thus,the study of multi-wavelength ghost imaging is necessary in practical applications of the ghost imaging techniques.In this dissertation,we start our study from the second-order correlation function,which is most important part in ghost imaging technique.Three different multi-wavelength ghost imaging schemes is discussed respectively,and the multi-wavelength ghost imaging scheme based on white light illumination is selected as the experimental scheme.By using this scheme,the color information of the object is reconstructed(in RGB color space),and the spectral information of the object which is obtained by ghost imaging technique,are compare with the spectral curve which is obtained by multi-wavelength ghost imaging experiments.Due to the quality issues in the reconstructed colorized image,the imaging scheme based on hadamard illumination and an optimized six-wavelength ghost imaging scheme is proposed,the quality of the reconstruction is improved.Based on the results,we found that the quality of the colorized image which is reconstructed by ghost imaging scheme,is related to the weight distribution of different wavelength channels.For the acquisition of spectral information,the relationship between the fixed spectral curve of the spectrometer and our experimental data are compare and discussed.The result suggests that,the spectral information of the object can be reconstructed by multi-wavelength ghost imaging scheme.The color information and spectrum information of multi-wavelength ghost imaging studied in this dissertation are the theoretical basis in the field of ghost imaging and spectral imaging,especially the multi-spectral camera based in multi-wavelength ghost imaging technology.The researches introduced in this dissertation are helpful for the practical applications of multi-wavlength ghost imaging in the field of spectrum imaging.