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| 远焦区聚焦性能分析与改善 | |
| 引用本文： | 孙明磊,石晶欣,董代,宗光华. 远焦区聚焦性能分析与改善[J]. 北京航空航天大学学报, 2008, 34(9): 1032-1036 |
| 作者姓名： | 孙明磊 石晶欣 董代 宗光华 |
| 作者单位： | 1.北京航空航天大学 机械工程及自动化学院, 北京 100191 |
| 基金项目： | 国家高技术研究发展计划(863计划)，国家211学科建设资助项目 |
| 摘 要： | 传统聚焦测度函数在远焦区对图像高频能量解析性能较差;表现为聚焦曲线在远焦区呈现非单调性.利用傅里叶变换方法对图像频谱进行分析:在远焦区,聚焦图像序列的直流分量表现出强烈的波动性,并且直流分量在图像频谱中占据绝对比例,再加上传统聚焦函数滤除图像直流分量的能力较弱,导致误聚焦概率高.考虑到频域聚焦函数计算量大,提出基于时域的两个聚焦函数.实验结果表明:此二函数具有强的直流分量滤除能力,能有效改善聚焦曲线在远焦区的表现,同时具有高的聚焦分辨率.远焦区聚焦性能的改善对于提高显微视觉操作自动化的可靠性尤为重要. |
| 关 键 词： | 视觉 聚焦 图像 傅里叶变换 微操作 |
| 收稿时间： | 2007-08-27 |
Performance analysis and improvement on acutely defocused scenes |
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| Sun Minglei,Shi Jingxin,Dong Dai,Zong Guanghua. Performance analysis and improvement on acutely defocused scenes[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(9): 1032-1036 | |
| Authors: | Sun Minglei Shi Jingxin Dong Dai Zong Guanghua |
| Affiliation: | 1.School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China2. Beijing Aerospace Control Device Institute, Beijing 100039, China |
| Abstract: | Some classic focusing measures such as gradient function,Brenner function and entropy function,et al,show poor performance in computing high frequency energy in acutely defocused images.Their focusing curves away from the focus show serious nonmonotonicity.The Fourier transform method for image series spectrum analysis was conducted.Three reasons for poor performance in far away focus region were proposed.Firstly,defocused image sequences show strong volatility in power of DC(direct current) component.Secon... |
| Keywords: | vision focus image Fourier transform micro-manipulation |
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