一种基于清晰域的自动聚焦算法  

An auto-focusing algorithm based on clear domain

作　　者：何帆 王少志 徐晓文 张琴[3] 陈阔 赵志强[2] HE Fan;WANG Shao-zhi;XU Xiao-wen;ZHANG Qing;CHEN Kuo;ZHAO Zhi-qiang(School of Software Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;China School of Software Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Bioinformatics Engineering Institute,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学自动化学院,重庆400065 [2]重庆邮电大学软件工程学院,重庆400065 [3]重庆邮电大学生物信息工程院,重庆400065

出　　处：《光电子．激光》2021年第1期25-34,共10页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金项目(61905033)资助项目。

摘　　要：为了解决自动聚焦系统搜索效率较低问题,本文 提出了一种基于清晰域的自动聚焦算 法。该算法创新性的提出了清晰域的概念,自动聚焦系统中寻找最清晰图片的问题转化为寻 找清晰区域的问题。同时为了解决实际聚焦过程中所遇到的次峰干扰问题,提出了高通滤波 的方法,对抗次峰干扰。本文设计了两组实验,通过对比应用本文算法前后的搜索效率表现 判断所提出算法的可行性,实验一验证高通滤波对于抵消次峰干扰的可行性,实验二验证清 晰域的自动聚焦算法对提升搜索效率的可行性。实验一的结果证明了高通滤波对非失真情况 下的次峰干扰有一定抑制的效果,实验二的结果表明在对经过高通滤波后的图像应用清晰域 ,能够提升8%-18%的搜索效率。In order to solve the problem of low search efficiency in autofocus sy stem,this paper proposes an autofocus algorithm based on clear domain.The algo rithm innovatively proposes the concept of clear region,and the problem of find ing the clearest image in auto focus system is transformed into the problem of f inding clear area.At the same time,in order to solve the problem of secondary peak interference in the actual focusing process,a high pass filtering method is proposed to combat the secondary peak interference.In this paper,two groups of experiments are designed to judge the feasibility of the proposed algorithm by comparing the performance of the search efficiency before and after the applic ation of the algorithm in this paper.Experiment 1verifies the feasibility of high pass filtering for eliminating the secondary peak interference,and Experime nt 2verifies the feasibility of the clear domain autofocus algorithm for improving the search efficiency.The results of Experiment 1show that the high pass filter has certain suppression effect on the secondary peak interference without distortion.The results of Experiment 2show that the high pass filter can improve the search efficiency by 8%-18%when the clear region is applied to the image after high pass filtering.

关 键 词：自动聚焦系统 高通滤波 清晰域 

分 类 号：O437.5[机械工程—光学工程]