| 一种复合的自动对焦方法在影像测量仪中的应用 |
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| 引用本文： | 王平江,陈德军,巫孟良,陈吉红.一种复合的自动对焦方法在影像测量仪中的应用[J].中国机械工程,2007,18(21):0-2527. |
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| 作者姓名： | 王平江 陈德军 巫孟良 陈吉红 |
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| 作者单位： | 1. 华中科技大学国家数控系统工程技术研究中心,武汉,430074
2. 万濠精密仪器有限公司,东莞,523877 |
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| 摘 要： | 介绍了三种常用的自动对焦评价函数——方差评价函数、梯度评价函数、频谱评价函数,并对后两种评价函数进行了优化。对比分析了三种评价函数在评价的灵敏度、稳定性和计算速度上的优缺点,在此基础上提出了一种三阶段复合的自动对焦方法,该方法在影像测量仪上表现出良好的对焦特性,可以在保证对焦精度的同时实现快速对焦。
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| 关 键 词： | 自动对焦 图像清晰度 评价函数 灵敏度 稳定性 |
| 文章编号： | 1004-132X（2007）21-2555-06 |
| 修稿时间： | 2006-09-06 |
Implementation of a Multiple Automatic Focusing Algorithm for Video Measuring System |
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| Wang Pingjiang,Chen Dejun,Wu Mengliang,Chen Jihong.Implementation of a Multiple Automatic Focusing Algorithm for Video Measuring System[J].China Mechanical Engineering,2007,18(21):0-2527. |
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| Authors: | Wang Pingjiang Chen Dejun Wu Mengliang Chen Jihong |
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| Affiliation: | 1. National Numerical Control System Engineering Research Center, Huazhong University of Science; 2. Rational Precision Instrument Co. and Technology, Wuhan, 430074 ,Ltd. ,Dongguan, Guangdong,523877 |
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| Abstract: | Three common evaluation functions for automatic focusing were introduced.They were deviations function,gradient function and frequency-spectra function,the later two were optimized.Their merits and deficits in delicacy,stability and velocity were analyzed.And a multiple automatic focusing algorithm based on three-stages was proposed herein.It performs well in the video measuring system and can focus exactly and rapidly. |
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| Keywords: | automatic focusing image definition evaluation function delicacy stability |
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