| 星载激光光斑影像质心自动提取方法 |
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| 引用本文： | 袁小棋,李国元,唐新明,高小明,黄庚华,李野.星载激光光斑影像质心自动提取方法[J].测绘学报,2018,47(2):135-141. |
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| 作者姓名： | 袁小棋 李国元 唐新明 高小明 黄庚华 李野 |
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| 作者单位： | 1. 长春理工大学, 吉林 长春 130022;2. 国家测绘地理信息局卫星测绘应用中心, 北京 100048;3. 江苏省地理信息资源开发与利用协同创新中心, 江苏 南京 210023;4. 中科院上海技术物理研究所, 上海 200083;5. 中国科学院空间主动光电技术重点实验室, 上海 200083 |
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| 基金项目： | 国家自然科学青年基金(41601505)，国家高分辨率对地观测青年基金(GFZX04061502)，国家重点研发计划(2016YFB0501005)，国家测绘地理信息局2018年基础测绘科技项目(2018KJ0204)，中国科学院空间主动光电技术实验室开放基金，The National Natural Science Foundation of China(41601505)，The National High Resolution Earth Observation Foundation for Young Scientists of China(GFZX04061502)，The National Key Research and Development Program of China(2016YFB0501005)，The Surveying and Mapping Basic Research Program of National Administration of Surveying |
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| 摘 要： | 激光光斑影像的质心提取是卫星激光测高数据处理中的重要环节，对于获得精确的激光指向角有重要的意义。本文总结了灰度重心法、高斯拟合法以及椭圆拟合法3种常用的质心提取方法，在比较其优缺点之后结合高斯曲面拟合法和椭圆拟合法，提出了一种基于高斯阈值的椭圆拟合方法，针对仿真数据进行试验，有较好的精度结果。采用GLAS（geoscience laser altimeter system）的实际激光光斑影像LPA（laser profile array）数据进行试验，发现LPA光斑质心位置变化周期约为1.5 h，幅度最大可达2~3个像素，对应激光指向角变化约9"，说明在轨监视激光质心位置变化对于提高激光指向角测量精度非常必要。相关结论可为后续国产卫星激光测高仪足印影像处理提供参考。
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| 关 键 词： | 卫星激光测高 激光光斑 足印影像 LPA影像 质心提取 |
| 收稿时间： | 2017-09-12 |
| 修稿时间： | 2017-12-04 |
Centroid Automatic Extraction of Spaceborne Laser Spot Image |
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| YUAN Xiaoqi,LI Guoyuan,TANG Xinming,GAO Xiaoming,HUANG Genghua,LI Ye.Centroid Automatic Extraction of Spaceborne Laser Spot Image[J].Acta Geodaetica et Cartographica Sinica,2018,47(2):135-141. |
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| Authors: | YUAN Xiaoqi LI Guoyuan TANG Xinming GAO Xiaoming HUANG Genghua LI Ye |
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| Institution: | 1. Changchun University of Science and Technology, Changchun 130022, China;2. Satellite Surveying and Mapping Application Center, Beijing 100048, China;3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;4. Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;5. Key Laboratory of Space Active Opto-electronics Technology, Chinese Academy of Sciences, Shanghai 200083, China |
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| Abstract: | The centroid extraction of laser spot images is an important part of satellite laser altimetry data processing,and has significance for obtaining accurate laser pointing angle.This paper summarizes the gray centroid method,Gauss fitting and elliptical fitting method,and compares their advantages and disadvantages.Based on this,a kind of elliptical fitting method combined with the Gaussian threshold is proposed.According to the simulation data test,the accuracy of the method is considerable.Moreover,the real laser spot image-LPA (laser profile array) of GLAS (geoscience laser altimeter system) data is implemented and validated.And the result shows that periodic variation of centroid of LPA is about for 1.5 hours and up to 2～3 pixels,which means the laser pointing angle maybe change 9 arc-seconds and it is necessary to improve the measurement accuracy of laser pointing angle by on-orbit change monitoring of laser centroid position.The conclusions can provide some valuable reference for the footprint images processing of domestic satellite laser altimeter. |
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