| 基于联合变换相关器的像移测量方法研究 |
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| 引用本文： | 葛任伟,吴清文,王运,颜昌翔.基于联合变换相关器的像移测量方法研究[J].计算机仿真,2010,27(3):215-219. |
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| 作者姓名： | 葛任伟 吴清文 王运 颜昌翔 |
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| 作者单位： | 1. 中国科学院长春光学精密机械与物理研究所,吉林,长春,130033;中国科学院研究生院,北京,100039
2. 中国科学院长春光学精密机械与物理研究所,吉林,长春,130033 |
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| 摘 要： | 为了测量由卫星姿态不稳定或振动等原因引起的空间相机亚像元像移,对基于联合变换相关器的像移测量方法进行了研究,并进行计算机仿真。阐述了该方法的数学原理,面阵CCD的安装位置以及输入图像序列的获取方法。应用MatLab对图像进行线性插值获得具有亚像元像移的图像,并添加噪声使图像具有较低信噪比;对图片进行傅立叶变换得到联合功率谱,二值化处理后的功率谱再次进行傅立叶变换得到相关输出;用质量中心算法计算出像移量。结果表明,像移测量的精度不随景物的内容而变化,测量得到的像移误差均方根误差值小于0.2个像元。
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| 关 键 词： | 联合变换相关器 像移测量 傅立叶变换 质量中心算法 |
The Study of Image Motion Measurement based on Joint Transform Correlator |
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| GE Ren-wei,WU Qing-wen,Wang yun,Yan Chang-xiang.The Study of Image Motion Measurement based on Joint Transform Correlator[J].Computer Simulation,2010,27(3):215-219. |
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| Authors: | GE Ren-wei WU Qing-wen Wang yun Yan Chang-xiang |
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| Affiliation: | 1.Fine Mechanics and Physics/a>;Chinese Academy of Sciences/a>;Changchun Jilin 130033/a>;China/a>;2.Graduate School of Chinese Academy of Sciences/a>;Beijing 100039/a>;China |
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| Abstract: | To measure the sub-pixel image motion which is caused by satellite attitude instability or vibration,the joint transform correlator method was used and simulated.The mathematics principles were clarified,the position of matrix CCD on the focal plane and the method of getting input image were presented.Based on MatLab,sub-pixel image motion was oblained by linear interpolation and noise has been added to get low SNR image.The input image was Fourier transformed to get the spectrum image,binary image was resu... |
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| Keywords: | Joint transform correlator Image motion measurement Fourier transform Centre of mass calculation |
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