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| 同轴数字全息中粒子轴向的精确定位 | |
| 引用本文： | 李志斌,郑刚,章立新,刘刚.同轴数字全息中粒子轴向的精确定位[J].光电工程,2009,36(9). |
| 作者姓名： | 李志斌 郑刚 章立新 刘刚 |
| 作者单位： | 1. 上海理工大学,光学与电子信息工程学院,上海,200093;上海电力学院电力与自动化工程学院,上海,200090 2. 上海理工大学,光学与电子信息工程学院,上海,200093 3. 上海理工大学,动力工程学院,上海,200093 4. 上海电力学院电力与自动化工程学院,上海,200090 |
| 基金项目： | 上海市教委发展基金资助项日 |
| 摘 要： | 为了减小由于同轴数字全息系统的较大焦深而导致粒子的轴向深度定位具有的不确定性,本文提出了一种用于粒子轴向精确定位的基于最大梯度的自动聚焦算法.自动聚焦算法对包含粒子的对焦窗口中求出任意可能方向的梯度,比较后得到最大的梯度,利用最大的梯度作为最后的结果,其它的则丢弃.同时,考虑到自动聚焦算法的精确度和算法的稳定性,再引入阈值参数,利用这个阈值可以很好地滤除粒子再现像中的背号信息和噪声带来的干扰.经实验表明,该算法具有较好的单峰性和稳定性. |
| 关 键 词： | 数字全息 粒子轴向定位 自动聚焦 焦深 |
Accurate Axial Location for Particles in Digital In-line Holography |
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| LI Zhi-bin,ZHENG Gang,ZHANG Li-xin,LIU Gang.Accurate Axial Location for Particles in Digital In-line Holography[J].Opto-Electronic Engineering,2009,36(9). | |
| Authors: | LI Zhi-bin ZHENG Gang ZHANG Li-xin LIU Gang |
| Affiliation: | LI Zhi-bin 1a,2,ZHENG Gang 1a,ZHANG Li-xin1b,LIU Gang 2 ( 1. a. College of Optics and Electronics Engineering,b. College of Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China,2. Faculty of Electric and Automatic Engineering,Shanghai University of Electric Power,Shanghai 200090,China ) |
| Abstract: | Due to the Depth of Focus (DOF) which is tens of times more than particle diameter in digital in-line Fresnel holography system, resolution of particle axial position is low and uncertain. In order to reduce the impact of DOF,an auto-focusing algorithm for accurate location of particle was proposed based on the most gradient. In the focus window containing particle, the gradients in all possible directions were calculated. Then, all of the possible gradients were compared, and the largest gradient was chose... |
| Keywords: | digital holography axial location of particle auto-focusing focus depth |
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