| 联合变换相关法测量空间相机像移的抗噪性研究 |
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| 引用本文： | 樊超,李英才,靳婷傅,洪亮.联合变换相关法测量空间相机像移的抗噪性研究[J].宇航学报,2011,32(12):2635-2641. |
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| 作者姓名： | 樊超 李英才 靳婷傅 洪亮 |
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| 作者单位： | 1. 河南工业大学信息科学与工程学院，郑州 450001； 2.中国科学院西安光学精密机械研究所，西安 710119 |
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| 基金项目： | 国家973计划项目(2009CB724006) |
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| 摘 要： | 为了研究使用联合变换相关器测量空间相机像移时噪声对测量精度的影响，分别对相关器加入背景噪声和图像噪声，通过仿真得到5种不同处理方法在不同噪声水平下的测量误差，并利用搭建的实验平台验证了使用联合变换相关法测量空间相机像移的有效性。结果表明，相比于其它相关器处理方法，使用功率谱相减并以0值为阈值二值化的方法得到的像移测量精度较高，即使对于SNR=1的输入图像，在含有背景噪声时，像移测量误差不大于0.12个像元，完全满足空间相机的使用要求。
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| 关 键 词： | 光学相关 像移 测量 噪声 |
| 收稿时间： | 2010-12-22 |
Noise Immunity Research on the Measurement Method of Image Motion of the Space Camera Based on Optical Correlator |
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| FAN Chao,LI Ying-cai,JIN Ting,FU Hong-liang.Noise Immunity Research on the Measurement Method of Image Motion of the Space Camera Based on Optical Correlator[J].Journal of Astronautics,2011,32(12):2635-2641. |
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| Authors: | FAN Chao LI Ying-cai JIN Ting FU Hong-liang |
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| Affiliation: | 1.College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China; 2. Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China |
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| Abstract: | To research the influence of the noise on the measurement accuracy of the image motion of the space camera when using the optical joint transform correlator (JTC), the background noise and the pattern noise are added to the JTC respectively firstly. Then the measurement errors at different noise levels for the five kinds of different processing methods are emulated, and the validity of the image motion measured by the JTC is verified by an experimental platform. The results show that the measurement accuracy for the method of power spectrum subtraction and binaryzation with zero threshold is better compared with the other processing methods, the measurement error is no more than 0.12 pixel for the input image with SNR=1 and the background noise, thus meeting the operating requirement of the space camera completely.
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| Keywords: | Optical correlator Image motion Measurement Noise |
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