LAUSR

Deep learning methods have reached considerable achievement on remote sensing object detection in recent years. However, most methods are designed for single object detection, such as vehicles and ships, and have limited detection capabilities for the combined object with large scale and complex part structure. In this article, we propose a part-based topology distillation network (PTDNet) for accurate and efficient combined object detection in remote sensing imagery. Specifically, a part-based feature module is designed to extract the key parts information of a combined object in a weakly supervised manner. Besides, to balance the accuracy and efficiency of the model, with considering the topology structure of multiple parts in combined objects, a lightweight network training method based on partial topological feature distillation is proposed to improve the model performance without additional parameters. Experiments show that the PTDNet outperforms the state of the art methods and achieves 65.4% mean average precision and 84.1% accuracy for combined object detection.