面阵数字航测影像快速辐射校正方法与实现

Fast radiometric correction method and implementation for area-array digital aerial image

随着计算机软硬件的发展,特别是可编程图形处理单元(GPU)框架计算统一设备架构(CUDA)的不断进步,使得利用CUDA开发影像快速处理应用的需求大幅增加。本文在分析国产大面阵航测相机DMZⅡ辐射特性的基础上,提出了基于C UDA的面阵数字航测相机全色子影像快速辐射校正方法,阐述了具体实现步骤和线程配置方法,并利用DMZⅡ相机在某试验区获得的影像数据,开展快速辐射校正算法性能测试。结果表明,相较于传统中央处理器(CPU)串行编程方法,本文提出的方法可提高超13倍的计算效率,且逻辑明确,实现简单,可为开发类似影像快速处理需求的相关应用提供技术参考。

With the development of computer hardware and software,especially the continuous progress of the programmable graphics processing unit(GPU)framework compute unified device architecture(CUDA),the demand for developing image fast processing using CUDA has grown unprecedentedly.Hence,a CUDA-based fast radiometric correction method for all-color sub images of area-array digital aerial camera is proposed in this paper by analyzing the radiometric characteristics of DMZ II,and the specific implementation steps and thread configuration methods are described.Moreover,the performance of the fast radiometric correction algorithm is tested by using the image data obtained by DMZ II camera in a test area.The results show that,the proposed method can improve the computing efficiency by more than 13 times,and the logic is clear and the implementation is simple compared with the traditional central processing unit(CPU)serial programming method,so it can provide technical references for the development of related applications with similar image fast processing needs.