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数字图象清晰度评价函数研究
引用本文:李奇,冯华君,徐之海,边美娟,申溯,戴瑞春.数字图象清晰度评价函数研究[J].光子学报,2002,31(6):736-738.
作者姓名:李奇  冯华君  徐之海  边美娟  申溯  戴瑞春
作者单位:1. 浙江大学现代光学仪器国家重点实验室,杭州,310027
2. 中兴通讯股份有限公司上海第一研究所,上海,200231
基金项目:国家教委高等学校骨干教师资助计划资助项目
摘    要:分析了梯度函数、频谱函数和熵函数在自动对焦技术中的作用,并研究了评价函数的性能.实验表明,梯度函数具有运算速度快的优点,适用于需要实时成象的场合;而频谱函数具有灵敏度高、曲线尖锐的特点,能够满足高精度的要求.

关 键 词:图象清晰度  评价函数  自动对焦
收稿时间:2001/10/1
修稿时间:2001年10月1日

DIGITAL IMAGE SHARPNESS EVALUATION FUNCTION
Li Qi,Feng Huajun,Xu Zhihai,Bian Meijuan,Shen Su,Dai Ruichun State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou,China Shanghai No. Research Institute of Zhongxing Telecommunication Corp,Shanghai,China.DIGITAL IMAGE SHARPNESS EVALUATION FUNCTION[J].Acta Photonica Sinica,2002,31(6):736-738.
Authors:Li Qi  Feng Huajun  Xu Zhihai  Bian Meijuan  Shen Su  Dai Ruichun State Key Laboratory of Modern Optical Instrumentation  Zhejiang University  Hangzhou  China Shanghai No Research Institute of Zhongxing Telecommunication Corp  Shanghai  China
Institution:Li Qi,Feng Huajun,Xu Zhihai,Bian Meijuan,Shen Su,Dai Ruichun * State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou,China 310027 Shanghai No.1 Research Institute of Zhongxing Telecommunication Corp,Shanghai,China 200231
Abstract:Gradient function,frequency spectrum function and entropy function are main tools for evaluating digital image sharpness.This paper discussed their application in autofocus technology and studied feature of evaluation functions.Experimental results show that gradient function′s advantage is rapid speed and it can be used in real-time process,and frequency spectrum function has good sensibility and is qualified for higher accuracy.
Keywords:Image sharpness  Evaluation function  Autofocus
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