| 基于Hilbert-Huang变换的数字全息图中的零级项抑制 |
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| 引用本文： | 柴晓冬,李晓辉.基于Hilbert-Huang变换的数字全息图中的零级项抑制[J].计算物理,2009,26(4). |
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| 作者姓名： | 柴晓冬 李晓辉 |
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| 作者单位： | 1. 上海工程技术大学轨道交通学院,上海,201620
2. 安徽大学计算智能与信号处理教育部重点实验室,安徽,合肥,230039 |
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| 基金项目： | 国家自然科学基金，上海市教育委员会重点学科建设项目 |
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| 摘 要： | 针对数字全息图中的零级项问题,提出一种用Hilbert-Huang变换对零级项进行抑制的方法.首先将二维数字全息图数据展开为一维数据,然后用Hilbert-Huang变换进行经验模型分解,得到第一层的本征模函数,该函数包含了全息图的高频分量,继续分解,得到第二层的本征模函数,该函数包含了全息图的直流分量.实验结果证明,将第一层的本征模函数进行再现,即为零级项得到有效抑制的共轭像,第二层的本征模函数为零级项.该方法只需在空域中进行一次经验模型分解就可有效抑制零级项,较好地保存了原物波信息,在计算速度上具有明显优势.
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| 关 键 词： | 信息光学 光学信号处理 数字全息图 Hilbert-Huang变换 零级项 |
Suppression of Zero-order Term in Digital Holography Based on Hilbert-Huang Transform |
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| CHAI Xiaodong,LI Xiaohui.Suppression of Zero-order Term in Digital Holography Based on Hilbert-Huang Transform[J].Chinese Journal of Computational Physics,2009,26(4). |
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| Authors: | CHAI Xiaodong LI Xiaohui |
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| Institution: | 1.College of Urban Railway Transportation;Shanghai University of Engineering Science;Shanghai 201620;China;2.The Key Laboratory of Intelligent Computing and Signal Processing;Ministry of Education;Anhui University;Hefei 230039;China |
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| Abstract: | A zero-order term suppression method for digital holography with Hilbert-Huang transform is proposed.Two-dimensional hologram data are changed into one-dimensional data.The first order of intrinsic mode functions containing high frequency of hologram is obtained by Hilbert-Huang transform through empirical mode decomposition.The second order of intrinsic mode functions containing direct current component of hologram is obtained similarly.Experiments show that reconstructed image of the first order of intrin... |
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| Keywords: | information optics optical signal processing digital holography Hilbert-Huang transform the zero-order term |
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