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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  
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.
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