利用ASIFT并行改进算子的航空多视角大倾斜影像快速匹配方法  

A Fast Matching Method for Multi-view Large Oblique Aerial Image by ASIFT Parallel Improved Operator

作　　者：仇多兵 戴晨光[1] 季虹良 江腾达 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《测绘科学与工程》2017年第2期29-34,共6页Geomatics Science and Engineering

基　　金：国家863计划资助项目（2012AA12A302）.

摘　　要：相比传统垂直摄影模式，倾斜摄影获取的多视角倾斜航空影像存在大仿射变形特征匹配点少、误匹配点多、匹配耗时无法满足实时需求等问题。虽然ASIFT具有完全仿射不变性，对大仿射变形影像匹配效果较好，但计算复杂度高、耗时及效率低。因此，本文提出ASIFT基于GPU的并行处理，运用CPU协同GPU共同处理，提高处理效率。实验证明，GPU优化后的ASIFT处理结果精度可靠，相比ASIFT优化之前速度提高大约13倍，且匹配数量多。Compared with the traditional vertical photographing mode, multi-view oblique aerial images acquired by oblique photography have problems such as limited feature matching points, many mismatching points and time-consuming in large affine deformation, and they cannot meet the real-time needs. Although ASIFT is fully affine invariant and achieves better image matc- hing result in large affine deformation, it is complicated to calculate, time-consuming and inefficient. In this paper, a method u- sing CPU-GPU co-processing to improve processing efficiency is put forward based on GPU parallel processing with ASIFT. Ex- periment results show that the GPU-optimized ASIFT achieves reliable precision and an obvious acceleration effect. Compared with non-optimized ASIFT, the speed is improved by 13 times and more matching points are obtained.

关 键 词：倾斜影像匹配 完全仿射不变性 GPU并行处理 特征匹配 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]