Research On Wavefront Coding Passive Ranging And 3D Imaging

Wavefront coding technology is a kind of computational imaging technology that combines optical system and image processing.Through the known coding method when acquiring information,it can effectively perceive and repair the defocus change of the target,so it can pass the wavefront coding technology.The distance or depth information of the object space is perceived to achieve the purpose of passive ranging and threedimensional imaging,and has the advantages of simple structure,high responsivity,and high image quality.This paper mainly studies the wavefront coding passive ranging and threedimensional imaging technology,including the principle of wavefront coding system ranging and three-dimensional imaging,optical system,especially the design of phase mask as a key component,passive ranging and three-dimensional image.Refactoring algorithm.The main contents include:(1)Theoretical study of wavefront coding passive three-dimensional imaging technology.Starting from Fourier optics,the relationship between the point spread function of the wavefront coding system and the defocus aberration is theoretically demonstrated,and the wavefront coding system including the coding and decoding theory,the correlation between the target depth information and the defocus amount,etc.The theory of passive three-dimensional imaging is studied.(2)Design of the phase mask.Firstly,the common algorithm of phase mask optimization is studied.The optimal solution of phase mask parameters is obtained according to the optimization of basic optical system.The theoretical calculation,simulation analysis and experimental verification of the shape and peak position of the point spread function are carried out.(3)Research on image reconstruction methods.A wavefront coding 3D image reconstruction algorithm is proposed,which establishes a mathematically strict relationship between the defocus amount and the object space distance information and the image space point spread function peak offset.Firstly,the algorithm is simulated by MATLAB software.Secondly,the experimental platform is built to verify the actual accuracy of the algorithm and the feasibility of the measurement scheme,and the evaluation is given.