关键词: 光学遥感, 不同光学影像自动配准, 结构信息, SIFT特征

Abstract: The imaging model，acquired angle and resolution between imagery acquired by diverse remote sensing sensors are different，which throws a big difficulty in the registration between them.Aiming to this problem，the SIFT algorithm based on structural information is proposed.Firstly the SIFT descriptors which are robust to differences in angle and scale are normalized，which can reduce the impact of hue difference between imagery acquired by different sensors，and then the consistency check of structural information of SIFT matching couples improves the robustness of this algorithm，lastly with the help of least square method，the automatic registration is achieved.Two groups of images SPOT-5（Pan）and ASTER，SPOT-5（XS/XI）and TM，which have big differences in angle and scale，are tested.A mosaic is formed from the reference and registered sensed images.In the mosaic，lineal features are well-aligned，which effectively proves that this automatic registration algorithm is robust and has a high accuracy.

Key words: optical remote sensing, automatic registration of remote sensing imagery from different optical sensors, normalized SIFT descriptor, structural information