| 数字全息成像中基于导数的自动对焦算法 |
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| 引用本文： | 刘长庚,王大勇,张亦卓,赵洁,万玉红,江竹青. 数字全息成像中基于导数的自动对焦算法[J]. 中国激光, 2009, 36(11). DOI: 10.3788/CJL20093611.2989 |
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| 作者姓名： | 刘长庚 王大勇 张亦卓 赵洁 万玉红 江竹青 |
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| 作者单位： | 北京工业大学应用数理学院,北京,100124 |
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| 基金项目： | 北京市市属市管高校人才强教计划，北京市教育委员会科技发展计划重点项目资助课题 |
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| 摘 要： | 在数字全息成像自动对焦算法实现中引入适用的导数计算方法,形成了4种基于导数的对焦判据函数.通过分析在相移数字全息中记录全息图时引入的噪声在提取物光波复振幅过程中的传递,研究了噪声对基于导数的自动对焦算法的影响,给出了不同算法的综合评价.数值仿真和光学实验处理结果表明,Prewitt梯度判据函数(PRG),Tenebaum梯度判据函数(TEG)与角谱再现算法结合可以形成快速可靠的自动对焦算法.
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| 关 键 词： | 数字全息 自动对焦 导数判据 角谱再现 噪声 |
Derivatives-Based Autofocus Algorithms for the Digital Holographic Imaging |
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| Liu Changgeng,Wang Dayong,Zhang Yizhuo,Zhao Jie,Wan Yuhong,Jiang Zhuqing. Derivatives-Based Autofocus Algorithms for the Digital Holographic Imaging[J]. Chinese Journal of Lasers, 2009, 36(11). DOI: 10.3788/CJL20093611.2989 |
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| Authors: | Liu Changgeng Wang Dayong Zhang Yizhuo Zhao Jie Wan Yuhong Jiang Zhuqing |
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| Abstract: | Four derivatives-based autofocus criteria functions are proposed through bringing several applicable computational methods of derivatives into the study of autofocus algorithms for the digital holographic imaging. By analyzing the transfer of noise produced during recording in phase shifting digital holography, the impact of noise on the derivatives-based autofocus algorithms is investigated. The results from the simulation and experiment indicate Prewitt gradient (PRG) and Tenebaum gradient (TEG) criteria functions, together with the angular spectrum reconstruction routine can form two types of efficient and reliable autofocus algorithms. |
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| Keywords: | digital holography autofocus derivatives-based criteria angular spectrum reconstruction noise |
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