关键词: 合成孔径雷达(SAR), 小波变换, 多尺度图像特征匹配, 图像比对

Abstract: Synthetic Aperture Radar (SAR) produces images of terrain targets by synthetically processing the returned signals and simulate them into a few hundred or even thousands meters antenna in order to increase the azimuth resolution through the same pulse compression technique, while using the movement of the installation platform of the radar and shining beams to the target from different time and from different positions. Currently, SAR imaging technique has become very crucial to obtain all kinds of information in many applications. For example, SAR imagery system is installed extensively in spy planes and satellites. Therefore, the vast amounts of data will be gathered via SAR every day, and it is very necessary to process them fast and accurately obtain the important information. This article developed a SAR image comparison method based on multi-scales wavelets transform by means of feature matching. This method will identify the Region of Interest (ROI) automatically and quickly for the SAR images of same region collected at different time. The experimental data indicates that this method can perform accurate SAR image comparison and ROI identification which has huge practical value.

Key words: Synthetic aperture radar, wavelet transform, multi-scales image feature matching, image comparison