Research On Super-resolution Imaging Technology Based On Programmable Aperture

Long-range high-resolution imaging is an important research topic in the field of military reconnaissance and public security.In recent years,the development of computational imaging technology has provided new ideas for non-scanning super-resolution imaging,the most representative of which is Fourier ptychography(FP)method.In this paper,a pixel superresolution imaging algorithm based on Fourier ptychography is proposed,and a corresponding integrated and systematic programmable aperture coding super-resolution imaging system is constructed.The main research work and innovation points are summarized as the following aspects:(1)A programmable aperture coding imaging system is built,and the selection of optical components of the imaging system,the construction steps of the system,and the design principle of the optical path are introduced in detail.(2)The imaging model of the programmable aperture imaging system is analyzed,and the expression of the incoherent transfer function is derived and its characteristics are analyzed.Two optical transfer function calibration methods,"sub-pixel shift method" based on point spread function and optical pupil measurement method,are proposed and verified by experiments.(3)A pixel super-resolution imaging algorithm based on Fourier ptychography is proposed.The algorithm theoretically increases the resolution of the imaging system by a factor of 2.5.The corresponding optimal aperture coding pattern is designed and the simulation verification is given.(4)Two experimental system error correction methods are proposed.Aiming at the image drift caused by the relative jitter between the target and the imaging system,airflow disturbance and imaging system aberration,a correction method based on simulated annealing is proposed.Aiming at the problem of noise pollution,an adaptive step size pixel super-resolution algorithm based on Fourier ptychography in non-coherent imaging is proposed.(5)Long-distance experimental tests of programmable aperture super-resolution prototype are done.Super-resolution experiments are performed on multiple indoor targets and outdoor scenes,and the resolution of the imaging system is increased by 2.27 times in the experiment.