Research On Image Reconstruction Technology Of Computational Optical Imaging System

In recent year,optical computing imaging technology is a new imaging technique has been put forward widely at home and abroad.Compared with the traditional imaging systems,computational imaging uses the special way of combining optical design and image processing.The system not imaging directly but only record information of target in some ways,and then deal with the data for the reconstruction to get the final image.This new imaging methods develo p the potential of the traditional optical imaging,and make up for the deficiency of the traditional optical system.This paper mainly studies three kinds of typical optical imaging system as follows: 1.the wavefront coding system,2.light field camera system,3.multiple scale prism array imaging system.Firstly,the system simulation model is established in optical design software to get a more accurate simulation results,and then study the properties of the imaging system,to find the method of image reconstruction.The next step is coding reconstruction program to reconstruct emulational or actual system.Finally we use some appropriate evaluation methods to evaluate the reconstruction results.The main contents include those following chapter.(1)Firstly,we design the cubic phase mask and obtain the imaging results in the simulation software,and then the image is restored to verify the defocusing invariance of wavefront coding system.Adding mask in actual infrared dual band optical system template,collect point target as a point spread function(PSF)from collimator of 5 m focal length.After deconvolute to other target image,we adopte the total variational method to reduce the noise.Finally,we compute image SNR to verify results(2)The research on light field camera based on micro lens array imaging system: Firstly,we study the recording and transmission progress of light field according to relevant theory of light field.Then we collect images from actual light field camera imaging system.We can reconstruct a series of refocus image on different depth by adopting integral projection algorithm,frequency domain refocusing algorithm and scale interpolation algorithm separatly.Finally,we test the resolution ratio from image of a test plate to evaluate the results.(3)The research on prism array imaging system.Firstly we use the Zemax software to get relevant parameters such as refractive index?inclination angle and focal length in previous design results.And then we calculate the prism distortion function to set up the camera imaging model.We calibrate actual camera parameter by using image from actual camera.After that,we can correct distortion of image we obtained.Finally,we use the Surf algorithm to splice and interpolate the corrected image into the new grid,and obtaine the high-resolution large-field images.All three different systems are computational optical imaging systems,and the reconstruction of them can obtain better image quality.