River waterbody extraction from SAR images based on speckle reduction and multi-resolution topological analysis

YANG Yun, LI Yu, ZHAO Quanhua
2022 Acta Geodaetica et Cartographica Sinica  
Aiming at the discontinuity of river waterbody extraction from high-resolution SAR images caused by speckle noise and building occlusion, a river waterbody extraction method combining adaptive speckle reduction and multi-resolution topological analysis is proposed. Firstly, the Beta metric is introduced into the speckle reduction anisotropic diffusion to achieve adaptive speckle filtering of SAR images. Secondly, the local threshold segmentation and connected region identification are used to
more » ... ickly extract river waterbody segments from the denoised image. Then, a Gaussian pyramid is constructed with the smallest circumscribed convex polygon of the river waterbody segments as the object, and multi-resolution topological analysis is performed to obtain the information of river discontinuities. Finally, the regional growth strategy is used to distinguish the discontinuities layer by layer to realize the automatic connection of adjacent river waterbody segments. The proposed method is verified by TerraSAR-X and GF-3 high-score SAR images. The results show that the proposed method can effectively extract complete river waterbody. The effectiveness and robustness of the proposed method are verified by the qualitative and quantitative evaluation of multiple SAR images.
doi:10.11947/j.agcs.2022.20190395 doaj:d9fbbb483148422ea570f969fa6c8521 fatcat:gw5alek3bbefhj2jdskeixs45a