关键词: 雷达摄影测量, 视差模型, 相关系数, 金字塔匹配, 外部DEM

Abstract: Matching between stereo SAR image pairs is crucial for Radargrammetry to extract height information since the matching accuracy will directly influence the accuracy of resultant DEM. The homologous points are difficult to identify in StereoSAR image pair due to complex geometric and radiometric distortions. In this paper, a new method is proposed to improve the matching performance. According to this method, an external DEM of coarse resolution is utilized as the auxiliary data from which the initial parallax can be derived to facilitate the step of image matching. At the same time, a pyramid delamination matching scheme is adopted to reduce the search range and thus improve the matching efficiency and control the propagation of gross errors. The experimental results show that the gross errors on the resultant DEM are reduced significantly with assistance of external DEM and the derived elevation accuracy is improved effectively.