DEFORMABLE SPHERICAL GEOMETRY TRANSFORMER FOR PANORAMIC SEMANTIC SEGMENTATION

The increasing availability of 360^◦ images has created a demand for effective Panoramic Semantic Segmentation (PASS) to enable comprehensive scene understanding. However, the spherical nature of 360^◦ image introduces significant spatial distortions due to Equirectangular Projection (ERP), making it challenging for traditional 2D methods, which are designed for Euclidean spaces. Existing PASS methods typically mitigate these distortions through developing spherical-to-tangent polyhedron transformations or specialized convolutional structures. Nevertheless, these approaches still struggle to preserve the spherical geometry and fail to adequately capture the semantic context of 360^◦ images. In this paper, we propose a Deformable Spherical Geometry Transformer (DSGT) network that adapts to spherical distortions through a local-global self-attention mechanism. The local self-attention module captures local semantic information to alleviate distortions, while the global self-attention module integrates spherical geometric priors to enhance predictions. Experimental results on the Stanford2D3D panoramic dataset demonstrate that DSGT outperforms state-of-the-art PASS methods.