Multifeature Semantic Complementation Network for Marine Oil Spill Localization and Segmentation Based on SAR Images

Marine oil spill causes severe damage to the marine ecological environment. Synthetic aperture radar (SAR) is widely used in marine oil spill detection due to its all-day and all-weather advantages. However, long stripe shape oil spill areas make it challenging to extract the oil spills effectively. A multifeature semantic complementation network (MFSCNet) is proposed for oil spill localization and segmentation of SAR images in one framework to address these problems. The long strip shape interference of oil spill is reduced by extracting intensity and damping ratio characters from nonpolarimetric features and entropy, anisotropy, and mean scattering angle from polarization features to form a multifeature SAR image. Then, the backbone feature network and feature fusion module are used for feature extraction. The decoupled head and the proposed oil spill semantic segmentation head are used for localization and semantic segmentation tasks, respectively. Also, the semantic complementation module is used in the training phase. It combines the results of localization and semantic segmentation to obtain complementation boxes for interactive iterative updating of the model parameters to enhance the detection accuracy of localization boxes. The effectiveness of the proposed model is demonstrated based on a lot of Sentinel-1 oil spill data compared with other state-of-the-art methods.