基于相机内外参数的机载光电平台图像几何校正  

Geometric Correction of Airborne Optoelectronic Platform Image Based on Internal and External Parameters

作　　者：李铁成[1,2,3] 刘晶红[1,3] 周前飞[1,2,3] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学材料学院,北京100049 [3]中国科学院航空光学成像与测量重点实验室,吉林长春130033

出　　处：《压电与声光》2016年第1期32-37,共6页Piezoelectrics & Acoustooptics

基　　金：吉林省重大科技攻关基金资助项目(11ZDGG001);装备预研基金资助项目(402040203);国家林业公益性行业科研基金资助专项(201204515)

摘　　要：传统机载光电平台图像几何校正依赖于控制点,实时性较差,不利于实现自动校正。该文在缺少控制点的情况下,通过相机内、外参数对机载光电平台原始图像进行几何校正。建立了正确的几何数学模型,采用Matlab的Camara Calibration Toolbox工具箱对相机进行标定获得相机内参数,采用惯性导航系统提取相机外参数,依据提取的内、外参数对图像的几何畸变进行校正。利用获得的实验数据对由同一相机拍摄的图像进行校正验证,实验结果表明,畸变图像得到了很好的还原,各姿态角测量精度为0.05°时,图像校正均方差约为0.996 3像素。研究表明,此方法准确、快速、直观,可移植性及实用性强。The traditional geometric correction of airborne optoelectronic platform relies on the control points and is not real-time,and is not benefit for realizing automatic correction.This work realizes the geometric correction process of distorted image completed by internal and external parameters when lacking control points.Based on the MATLAB camera calibration toolbox and inertial navigation systems,the projection matrix consisting of the camera′s internal and external parameters is obtained.The verification of the image′s correction is captured by the same camera,using experimental data which are already made.The experimental results indicate that the distorted image has been effectively restored.The mean square deviation of image correction is about 0.996 3pixels when the accuracy of attitude angle is 0.05°.Overall,the proposed method is time-efficient,direct,accurate,and easy to achieve transplantation in hardware.This method has fine validity in engineering applications.

关 键 词：航空光电成像 几何畸变校正 内参数 外参数 摄像机标定 

分 类 号：TM282[一般工业技术—材料科学与工程]