Topology-Aware Segmentation Using Discrete Morse Theory
Authors: Xiaoling Hu, Yusu Wang, Li Fuxin, Dimitris Samaras, Chao Chen
Venue: ICLR 2021 Spotlight
Keywords: Topology, Morse theory, Image segmentation
Abstract: In the segmentation of fine-scale structures from natural and biomedical images, per-pixel accuracy is not the only metric of concern. Topological correctness, such as vessel connectivity and membrane closure, is crucial for downstream analysis tasks. In this paper, we propose a new approach to train deep image segmentation networks for better topological accuracy. In particular, leveraging the power of discrete Morse theory (DMT), we identify global structures, including 1D skeletons and 2D patches, which are important for topological accuracy. Trained with a novel loss based on these global structures, the network performance is significantly improved especially near topologically challenging locations (such as weak spots of connections and membranes). On diverse datasets, our method achieves superior performance on both the DICE score and topological metrics.