航空影象与地图的配准纠正

Aerial Image Rectification by Matching Map

针对现有航空影象纠正软件存在的问题 ,提出了一种无数字地面模型支持的基于“图象与图形叠加配准”的纠正新方法 ,并介绍了基于索引彩色模式的图象与图形快速叠加技术 .对于影象纠正 ,在分析航空影象局部变形特点的基础上 ,提出了对局部变形进行纠正的经验公式 .最后 ,又将初纠正与局部纠正结合在一起 ,开发了一个完整的图象纠正软件 .同时还利用该软件对航空图象进行了纠正试验 ,纠正时共选择了 13个控制点 ,纠正后的图象与地图叠加显示出整体匹配很好 ,存在的残差也都在 2 pixel之内 .研究结果表明 ,该纠正方法是可行性的 。

This paper firstly analyzes problems existing in current rectification software,then presents a new rectification approach based on image and graphics overlaying and matching without the support of digital elevation model,and introduces fast overlaying technique of image and graphics based on indexed-color mode.To make rectification,this paper analyzes the feature of partial deformation,and presents a rectification formula for partial deformation based on experience.Finally,software of image rectification is developed combined general rectification and partial deformation rectification.In the experiment,a test image is rectified using the software with 13 selected control points,rectified image match the map very well by overlaying,and errors left are all within 2 pixels.The results show that rectification approach this paper presents is feasible and can be used to rectify image deformation induced by any factors.