| The resolution of an imaging system is often greatly limited by phase aberrations.Phase aberrations arise from different sources such as the atmospheric disturbance and errors of optical hardware. These unknown phase aberrations can corrupt the wave-front and cause the blurring of imagery. Phase Diverse Speckle (PDS) is a novel imaging corrective technique. It synthetizes the strongpoint of Phase Diverse and Speckle Imaging and can apply to extend object of a middle or close distance.It requires the simultaneous collection of one or more couples of shortly-exposured images, and then jointly estimates the object and the distortion from recorded images. The essence of PDS is the phase diversity in the pupil,this can be achieved by introducing known phase aberrations. The purpose of phase diversity is to gain the relation between the object and the pupil phase function, further more, to get a mathematical model which is independent of the object. This dissertation considers only a couple of images, and the diversity is provided with a known defocusing amount.The main content of research of this dissertation is as follows:(1) Study the sensitivity and restored result of Zernike polynomials coefficient in the condition of PDS Gauss mathematics model,Analyze the real effect of model software .(2) Study the algorithms of Simplex Method ,Simulating Annealing and the combination of both,improve the combination of two algorithms for the shortcoming.Use the tool of Visual C++6.0 to programme and realize.Show the flow chart of three algorithms.(3) Use three algorithms to optimize object funtion. Analyze applicability of this subjet using three algorithm.Do Simulation Study in given Zernike modes using the mixed algorithm.Use restrain to optimize object funtion of higher dimention.Show the the variance,the deviation and standard deviation of results and contrast the data.Use the MTF contrasts of conventional images to evaluate the restore image. |
PDF Full Text Request