“嫦娥一号”干涉成像光谱(IIM)数据坏点检测与去除研究  

Bad pixel identification and replacement research for Chang'E-1 IIM data

作　　者：王超[1,2] 施润和[1,2] 高炜[1,2,3] 吴昀昭[4] 

机构地区：[1]华东师范大学地理信息科学教育部重点实验室,上海200062 [2]华东师范大学教育部深空探测联合研究中心数据应用系统分中心,上海200062 [3]美国科罗拉多州立大学生态系统科学系,美国柯林斯堡80523 [4]南京大学地理与海洋科学学院,南京210093

出　　处：《中国科学：物理学、力学、天文学》2013年第11期1448-1456,共9页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：上海市科委世博专项(编号:10DZ0581600,13231203804);国家重点基础研究发展计划(编号:2010CB951603);国家自然科学基金(批准号:41201358,41172296);中国科学院数字地球重点实验室开放基金(编号:2011LDE006)资助项目

摘　　要：高光谱数据中离散分布的坏点的存在影响着数据的后续分析和应用.坏点的检测是一项复杂的工作,受仪器特征、地形地貌、成像时间等影响,很难建立统一的坏点判别阈值.本文研究了"嫦娥一号"干涉成像光谱仪(IIM)高光谱数据坏点在光谱维和空间维的特征,基于此提出了一种基于光谱角和欧氏距离的坏点检测与修正算法.算法有效地检测并修正了影像中的坏点,且较过去研究有着更高的精度.统计结果表明约25%的IIM单轨影像坏点数高于3000个;坏点具有列分布特征,主要分布在第27,77和123列及其相邻列上.经过坏点修正后IIM影像空间均一性得到提升,为后续研究与应用提供了更好的基础数据.The existance of discrete bad pixels in hyperspectral data have an negative impact on the subsequent data analysis and application. The identification process of the bad pixel is complex. It was influenced by the instrument characteristic, local geomorphology, imaging time and so on. It is diffcult to define a universal threshold to identify all the bad pixels in different images. In this manuscript, The spectral and spatial characteristic of the bad pixel in Chang＇E-1 Interference Imaging spectrometer （IIM） hyperspectral data were carefully investigated, and an algorithm for bad pixel identification and replacement based on spectral angle and Euclidean distance were proposed. The results show that the bad pixels were identified and replaced effectively, and yield a better precision than previous researches. The statistical results indicate that the number of IIM images which contains more than 3000 bad pixels is nearly 25 percent of the total. The bad pixels display a column-distribute feature within the images, primary distributed in column 27, 77, 123 and the adjacent columns. The spatial homogeneity of IIM images were improved after the bad pixels replacement. The bad pixel-replaced IIM images provide a better basic data for the subsequent researches and application of IIM hyperspectral data.

关 键 词：嫦娥一号 干涉成像光谱仪 坏点 光谱角 欧氏距离 月球 

分 类 号：V446.9[航空宇航科学与技术—飞行器设计]