基于CUDA架构的GF4影像快速正射纠正

Quick Orthographic Rectification Based on CUDA

传统串行正射纠正算法已无法满足GF4卫星影像的实时应用需求,以GPU为代表的高性能处理架构和并行算法已逐渐成为卫星数据处理的热点。本文提出一种基于CUDA架构的快速正射纠正算法,可在GPU设备上并行运算,通过实验对比分析,该方法具有较高准确性和加速比。此外,在正射纠正流程之前,本文利用DOM和DEM对GF4的RPC模型进行精化处理,以精化RPC模型作为纠正变换模型,保证了最终纠正结果的几何精度。

Traditional orthographic rectification cannot satisfy GF4’s instant demands for application.As the representative of the high performance processing architecture and parallel algorithm,GPU has gradually become the hotspot of satellite data processing.In this paper,a method of quick orthographic rectification based on CUDA is proposed,and it can parallel execute on GPU devices.The experiments shows that this method has higher accuracy and speedup ratio.Before executing the orthographic rectification flow,the paper firstly refines the RPC model of GF4 with DOM and DEM,then uses the refined RPC model as the correction transform model to ensure the geometric accuracy of final ortho image result.