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A Method of Tuning Focus for the Auto-Focusing System
Author(s): 
Pages: 83-86
Year: Issue:  5
Journal: Optics & Optoelectronic Technology

Keyword:  criterion functionauto-focusinggray relative methodcollect imagedefinition image colletion;
Abstract: The accuracy and efficiency of a focus on evaluation function are the key to auto-focusing based on digital image processing technique.In turn,a focus on evaluation function affects structure accuracy of auto-focusing system and complexity of calculation.In this paper,the relative method of the gray standard deviation and the relative method of the gray contrast are integrated.As a result,we get the relative method of the improved gray.The characteristics of the method are the fast response speed,the unsophisticated calculation,the high signal to noise ratio,the better reliability and so on.After a great deal of experiments and analysis,the obtained conclusion is that the method is suitable for the picture with complex detail and texture.The method is not suitable for the picture with high light background.
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