| 一种新的方法用于星敏感器近红外星图星点提取 |
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| 引用本文： | 廖育富,钟建勇.一种新的方法用于星敏感器近红外星图星点提取[J].红外与激光工程,2014,43(5):1667-1671. |
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| 作者姓名： | 廖育富 钟建勇 |
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| 作者单位： | 1.中国科学院光电技术研究所,四川 成都 610200; |
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| 基金项目： | 国家重点基础研究发展计划(2014CB744200) |
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| 摘 要： | 分析了近红外星图小波分解系数的特点。依据小波分析的边缘检测特性、解相关性和多分辨率特性结合星点的灰度分布特征设计了不同尺度下的检测模板。在恒虚警概率条件下，提出利用局部阈值克服红外星图本身的背景不均匀性。通过在星图第二次分解的近似系数上检测星点最大灰度值的位置，削弱了单点噪声和条纹噪声的影响。实验结果显示，算法能有效得出视场中的星点最大灰度值坐标，误差在1 个像素位置左右，满足后续星点提取的需要。
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| 关 键 词： | 近红外星图 小波分析 单点噪声 条纹噪声 星点提取 |
| 收稿时间： | 2013-09-20 |
A new method used for star distillation of near-infrared star image of star tracker |
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| Affiliation: | 1.Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610200,China;2.University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | The distillation of near-infrared star image of star tracker was analyzed in this paper. A new method for this problem was presented. Firstly, characters of near-infrared star image in wavelet domain were analyzed and mask used to detect stars in multi scales were designed according to the distribution of the gray of stars. Then, local threshold was applied to overcome the imbalance of the background under the constant false alarm rate. Lastly, positions of the heaviest gray values of stars in the secondly decomposed approximation coefficients were accessed, eliminating the effect of the single point noise and stripe noise. Experimental results indicate that the method could efficiently obtain the position of the heaviest gray value of detected stars with error around one pixel, which satisfies the requirement of estimation of centroid. |
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