基于重叠视场的拼接式高光谱相机非均匀性校正  

Non-Uniformity Correction Method for Splicing Hyperspectral Imager Based on Overlapping Field of View

作　　者：杨雷 周锦松[1,2,3] 景娟娟 聂博洋[1,3] YANG Lei;ZHOU Jin-song;JING Juan-juan;NIE Bo-yang(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Optoelectronics,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Computational Optical Imaging Technology,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学光电学院,北京100049 [3]中国科学院计算光学成像技术重点实验室,北京100094

出　　处：《光谱学与光谱分析》2023年第11期3582-3590,共9页Spectroscopy and Spectral Analysis

基　　金：中国科学院战略性先导科技专项(XDA17040203,XDA19010103);国家自然科学基金项目(21827808)资助。

摘　　要：高光谱遥感能够提供丰富的地球表面信息,因而受国内外学者的广泛关注。受到技术与工艺水平影响,目前单个高光谱相机无法同时满足成像大视场和高分辨率的应用需求。拼接式高光谱相机技术将多个高光谱相机组合成一个成像系统,有效地扩大了高光谱相机的视场,在精准农业、对地观测、环境监测等方面有着广泛的运用。由于探测器像元响应,光学系统,电子学系统等因素的影响,高光谱相机的焦平面阵列在同一均匀辐射源下,探测器单个像元输出会出现不一致的现象,该现象即为高光谱相机的非均匀性。拼接式高光谱相机的非均匀性会严重影响相机成像质量与图像判读。目前,非均匀性校正主要分为基于定标的校正方法和基于场景的校正方法两大类。通过对中国科学院空天信息创新研究院研制的拼接式高光谱相机非均匀性的分析,建立了单台相机和多台相机间的非均匀性模型,并根据非均匀性模型提出了一种基于重叠视场的拼接式高光谱相机非均匀性校正方法。该方法综合运用了实验室定标数据与实时飞行数据,利用实验室辐射定标校正单台相机非均匀性,利用相机间重叠视场并引入小波滤波计算非均匀性系数校正多相机间的非均匀性。由于该方法在实验室仅需要对单台相机进行辐射定标,因此也摆脱了需要大口径积分球光源的限制。开展了一系列对不同方法处理后图像质量进行评价的实验。选取了存在非均匀性两个不同的波段图像作为原始图像,并用该方法与对比方法对原始图像进行处理。为了能够定量地对不同方法的校正效果进行对比,引入了图像质量的提高系数(IF),非均匀性(NU)与光谱角(SA)三个评价指标。结果证明,本文提出的基于重叠视场的拼接式高光谱相机非均匀性校正方法具有最好的非均匀性校正效果,同时最大程度保留了光谱特Hyperspectral remote sensing can provide rich information on the earth s surface,so it has attracted extensive attention from scholars at home and abroad.Affected by the level of technology,a single hyperspectral imager cannot meet the application requirements of a large field of view and high resolution simultaneously.Splicing hyperspectral imager technology combines multiple hyperspectral imagers into one imaging system,effectively expands the field of view of hyperspectral imagers,and is widely used in precision agriculture,earth observation,environmental monitoring,etc.Due to the influence of detector pixel response,optical system,electronic system and other factors,the output of a single pixel of the detector will be inconsistent when the focal plane array of the hyperspectral imager is under the same uniform radiation source,which is the non-uniformity of the hyperspectral imager.The non-uniformity of splicing hyperspectral imager seriously affects the image quality and interpretation.Non-uniformity correction methods are divided into calibration-based and scene-based correction methods.In this paper,non-uniformity models of a single imager and multiple imagers are established based on the analysis of the non-uniformity of the splicing hyperspectral imager developed by Aerospace Information Research Institute.Based on non-uniformity models,a novel non-uniformity correction method based on overlapping fields of view is proposed.This method integrates the laboratory calibration and the real-time flight data.The laboratory radiometric calibration is used to correct non-uniformity of a single image,while the overlapping field of view and wavelet filter isused to correct non-uniformity of multiple imagers.This method only needs to calibrate the radiation of a single imager in the laboratory so that it eliminates the limitation of requiring a large-aperture integrating sphere.Several experiments are carried out to evaluate the quality of images processed by different methods.Images with non-uniformity of two diff

关 键 词：高光谱成像 视场拼接 非均匀性 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]