基于区域网平差的遥感影像色彩均衡算法  

Color Balance Algorithm for Remote Sensing Image Based on Block Adjustment

作　　者：卢其剑 刘世杰 何海清[1] 童小华 LU Qi-jian;LIU Shi-jie;HE Hai-qing;TONG Xiao-hua(School of Geomatics, East China University of Technology, Nanchang 330013, China;College of Surveying and Geo-Informatics,Tongji University,Shanghai 200090,China)

机构地区：[1]东华理工大学测绘工程学院,江西南昌330013 [2]同济大学测绘与地理信息学院,上海200090

出　　处：《东华理工大学学报（自然科学版）》2020年第2期159-163,共5页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(41771483)。

摘　　要：针对不同区域、不同时相的卫星遥感影像的整体匀光匀色这一问题,将区域网平差的方法引入遥感影像的色彩均衡处理中。对影像重叠区域划分均匀格网,利用方向梯度直方图(histogram of oriented gradient,HOG)算法提取各个格网特征,并根据其梯度距离和其灰度均值差值的3倍中误差进行同名格网的筛选,并将这些筛选后的同名格网平均灰度值作为待平差变量,基于二次多项式为平差模型求解各影像的色彩变换参数,得到的参数对每景影像做色彩校正,从而得到色彩均衡的影像序列。利用存在色彩差异的多时相Landsat5真彩色影像进行实验验证,从目视评价、处理前后影像质量定量分析以及平差精度等方面验证了基于区域网平差的遥感影像色彩均衡算法的可行性和有效性。Aiming at the problem of the overall processing of color balance of remote sensing images in different regions and different phases,the idea of block adjustment is introduced into the color balance processing of remote sensing images.Firstly,the overlapping areas of the image are divided into uniform grids.The Histogram of Oriented Gradient(HOG)algorithm is used to extract the features of each grid and filter the corresponding grids based on the gradient distance and the 3 times median error of the difference between their gray values.The average gray value of these filtered corresponding grids are used as the variable to be adjusted,and the quadratic polynomial is used as the adjustment model to solve the color transformation parameters of each image.Finally,the obtained parameters are used for color correction of each image to obtain color balanced image sequence.The multi-temporal Landsat5 true-color image with color difference is used for experimental verification.The feasibility and effectiveness of the color balance algorithm of remote sensing image based on block adjustment were verified from the aspects of visual evaluation,quantitative analysis of image quality before and after processing and adjustment accuracy.

关 键 词：遥感影像 区域网平差 二次多项式 色彩均衡 

分 类 号：P237[天文地球—摄影测量与遥感] TP753[天文地球—测绘科学与技术]