An Improved Method for Remote Sensing Image Registration
CHEN Chao 1,2 , QIN Qiming 1, , JIANG Tao 2,3 , JIANG Hongbo1, ZHANG Ning 1 1. Institute of Remote Sensing and GIS, Peking University, Beijing 100871; 2. Geomatics College, Shandong University of Science and Technology, Qingdao 266510; 3.Key Laboratory of Surveying and Mapping Technology on Island and Reed, State Bureau of Surveying and Mapping, Qingdao 266510
With the analysis of the current methods for image registration, an improved method based on feature point has been proposed. Firstly, segmentation are conducted to the reference image and a number of feature points are extracted from each sub-picture to ensure the feature points are evenly distributed over the image. Subsequently, the known corresponding points are fitted to the transformation equation to obtain the rough matched points with the pending registration points. Then a small area search is carried out for precision registration with the rough matched point as the center according to the similarity measurement. Finally, the correct corresponding points are determined and fulfill the overall image registration. To validate the efficiency of the method, simulation experiments are applied for the optical images with large deformation and with large displacement of the sensor. The results show that the improved method proposed is a good way to solve the registration of optical remote sensing images. It can also reduce time complexity of extracting feature points and finding corresponding points.