基于倾斜刃边法的调制传递函数计算及图像复原  

Modulation Transfer Function Calculation and Image Restoration Based on Slanted-Edge Method

作　　者：李铁成[1] 陶小平[1] 冯华君[1] 徐之海[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《光学学报》2010年第10期2891-2897,共7页Acta Optica Sinica

基　　金：国家973计划(2009CB724006);国家863计划(2009AA12Z108);国家自然科学基金(60977010)资助课题

摘　　要：调制传递函数(MTF)是描述光学成像系统信息传递频率特性的一个关键指标。在成像系统满足线性和空间不变性的条件下,对于含有点、狭缝和边缘等不同特征的图像,可以使用相应的方法计算得到成像系统的MTF。采用了倾斜刃边法来计算得到成像系统的MTF,分析了成像器件和算法步骤对计算结果产生的影响,进行了相应的校正,提高了计算结果的准确性。运用MTF补偿(MTFC)技术,分别使用了镜头MTF的设计值、测量值和计算值对实际拍摄得到的图像进行了复原。通过对以上3种复原图进行对比,实验结果证明了MTF计算值的可靠性和用于降质图像复原时的有效性。The modulation transfer function（MTF） is one of the key indicators characterizing the signal transfer characteristics of an imaging system as a function of spatial frequency in terms of linear response theory.Various methods have been proposed to determine the MTF of an imaging system which is based on point,slit or edge images.The slanted-edge method to calculate the MTF is used.The method is modified to correct the bias caused by sensor and calculation procedure.The designed MTF,measured MTF,and calculated MTF have all been utilized to restore the remote sensing images by MTF compensation.All of the improved images are compared and the result verifies the effectiveness and reliabilities of the calculated MTF in the restoration of the degraded images.

关 键 词：图像处理 调制传递函数 倾斜刃边法 边缘扩展函数 线扩展函数 

分 类 号：O436[机械工程—光学工程]