The Algorithm Of DMD Coding Based Sepctral Imaging

Spectral imaging has functions of camera and spectrometer.It can also obtain both spatial information and spectral information,so it has extremely high application value in various fields.This paper mainly discusses the algorithm of DMD coding based spectral imaging.The main arrangement of thie paper is as follow.1.This paper introduces the imaging spectrometer and its classification and application.The research status of imaging spectrometer are also introduced.Then the coding spectrometer imaging is introduced.DMD coding imaging spectrometer is one of them,and its advantages are illustrated.2.The digital micromirror DMD is an important part of the coded imaging system.As an encoder,DMD coding has a great advantage in coding imaging spectrometer.At the same time,the system principle of DMD code imaging spectrometer is introduced:double-grating spectral coding structure and single grating spatial coding structure.3.The definition and properties of Hadamard matrix and its related matrix are introduced.In DMD coding,cyclic S matrix is generally used to realize 0-1 coding.The principle of Hadamard transformation is based on the weighing principle in mathematical statistics.Simulation on MATLAB shows that the reconstruction accuracy of detecting is very good.4.It mainly introduces the principle of compressed sensing,which is composed of three parts: sparse representation of signal,measurement matrix,and reconstruction algorithm.Coded aperture snapshot spectral imager(CASSI)is a single grating system,which can greatly save the data needed to be stored and transported,and save time.The performance of measurement matrix can affect the quality of reconstruction very much.The performance of measurement matrix is tested by simulation.The reconstruction quality of compressed sensing imaging spectrometer is not as good as that of Hadamard transform imaging spectrometer.