| 一种基于分数阶Fourier变换的光斑图像抑噪方法 |
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| 引用本文： | 孙延鹏,梁小骜,张芝贤,王尔申.一种基于分数阶Fourier变换的光斑图像抑噪方法[J].解放军理工大学学报,2012,0(2):124-128. |
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| 作者姓名： | 孙延鹏 梁小骜 张芝贤 王尔申 |
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| 作者单位： | 沈阳航空航天大学 电子信息工程学院，辽宁 沈阳 110136 |
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| 基金项目： | 辽宁省博士启动基金资助项目（20101081）. |
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| 摘 要： | 在激光光斑中心定位系统中，光斑图像噪声直接影响中心定位的精度。为了保证光斑重心的测量精度，抑制光斑图像噪声，针对信号和噪声有很强的时频静合特性，通过分数阶Fourier变换（FRFT）分析了含噪声激光光斑图像在分数阶Fourier域的幅度特征，在一维信号分数阶滤波系统参数估计的基础上，利用多阶段的滤波结构滤除激光光斑图像中的高斯噪声。仿真结果表明，该算法能较好地在强噪声背景下将光斑图像恢复出来，抑噪后的光斑基本能满足激光光斑中心定位系统的预处理要求。
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| 关 键 词： | 分数阶Fourier变换 分数阶滤波 光斑图像 |
| 收稿时间： | 2010-05-18 |
| 修稿时间： | 2010-05-18． |
Inhibiting noise method of spot image based on fractional Fourier transform |
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| SUN Yan-peng,LIANG Xiao-ao,ZHANG Zhi-xian and WANG Er-shen.Inhibiting noise method of spot image based on fractional Fourier transform[J].Journal of PLA University of Science and Technology(Natural Science Edition),2012,0(2):124-128. |
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| Authors: | SUN Yan-peng LIANG Xiao-ao ZHANG Zhi-xian and WANG Er-shen |
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| Institution: | School of Electronics Information Engineering，Shenyang University of Aeronautics and Astronautics，Shenyan 110136，China |
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| Abstract: | In the laser spot center location system, spot image noise has a direct influence on the accuracy of the positioning center. By fractional Fourier transform (FRFT),the amplitude characteristics of the laser spot image with noise in the fractional Fourier domain was analyzed, based on the one dimensional signal parameter estimation of the fractional filtering system.Multi stage structure was used to filter Gaussian noise in the laser spot image. Simulation results show that the algorithm can totally restore the spot image in strong background noise .The spot image after de noise can satisfy the requirements of the laser spot positioning system. |
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| Keywords: | FRFT(fractional Fourier transform) fractional filtering spot image |
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