Stationary Phase Approximations in Fresnel-Zone Magnitude-Only Reconstructions

摘要

An analytic approximation of an iterative method of image reconstruction from Fresnel zone magnitude data is discussed. The method of stationary phase is used to estimate both the Fresnel zone transform and the inverse Fresnel zone transform. With this theory we can explain why fewer iterations are needed for good images to be obtained at locations in the Fresnel zone region of an optical processor that are farther from the Fourier transform.