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一类离焦虹膜图像复原算法的研究

DOI: 10.3724/SP.J.1004.2012.00959, PP. 959-968

Keywords: 虹膜识别,点扩散函数,图像复原,逆滤波

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Abstract:

?通常,虹膜识别系统中采集设备的景深(Depthoffield,DOF)都很小,在采集过程中经常出现离焦现象,理论和实际应用都需要研究这种离焦图像的复原方法.本文研究了一种点扩散函数(Pointspreadfunction,PSF)为正六边形的示性函数的离焦虹膜图像复原问题.通过分析PSF频域零点的分布规律,从理论上证明了距频域中心最近的第一圈零点的零点定理,证明过程中也提供了计算这些零点的方法,在此基础上,给出了这一类离焦图像复原的快速算法.实验结果验证了算法的有效性与实时性.

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