船用星敏感器星点质心精确提取方法  

Accurate star centroid extraction for shipboard star sensor

作　　者：佟帅[1] 李辉[1] 王安国[1] 

机构地区：[1]海军大连舰艇学院航海系,辽宁大连116018

出　　处：《应用光学》2013年第6期914-919,共6页Journal of Applied Optics

基　　金：国家科技支撑计划课题(2012BAH36B03)

摘　　要：从星空图像中提取星点质心是星敏感器工作的重要基础,针对船用星敏感器所获取的星空图像噪声情况复杂的特点,提出一种基于重心法的星点质心精确提取方法。通过块扫描的阈值分割和星象连续性的噪点剔除,引入灰度信息参考的星象提取以及重心法质心坐标计算等步骤,从星空图像中提取星点质心。对于30幅海上实拍星图实验,该方法能够100%提取出至少10颗星点,质心坐标提取精度达到1/20像素,并且可以实现对视频图像的实时处理,满足船用星敏感器的应用需求。Star centroid extraction is an important basis of star sensor. As for the complicated noise condition of offshore star image, a new star extraction method based on gravity method was proposed, which included four steps： block scan threshold segmentation, noise rejection based on star continuity, star extraction considering gray information and gravity method for centroid coordinate calculation. The algorithm was proved in experiments using 30 offshore star images that it could extract at least 10 stars centroids correctly with a success rate of 100% and an accuracy of 1/20 pixel while achieving real-time processing for video. Application re- quirements of shipboard star sensor could be satisfied.

关 键 词：天文导航 船用星敏感器 星空图像 质心提取 

分 类 号：TN202[电子电信—物理电子学] TP391.9[自动化与计算机技术—计算机应用技术]