Abstract
Generally,acquisition equipments in iris recognition systems have a shallow depth of field(DOF),which are very sensitive to defocus.Methods to recover defocused images are needed both in theoretical researches and in real-world applications.In this paper,an indicator function of regular hexagon was used as the point spread function(PSF) to solve the recovery problem of defocused iris images.By analyzing the zero distribution of PSF in frequency domain,we theoretically,proved the zero theorem for the round of zero points nearest to the center of frequency domain.We also provided the computational method to find zero points and the fast algorithm to recovery this kind of defocused images.The experimental results showed the efficiency of the algorithm.
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