3DOS: Towards Open Set 3D Learning: Benchmarking and Understanding Semantic Novelty Detection on Pointclouds

28. Listopad 2022

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In recent years there has been significant progress in the field of 3D learning on classification, detection and segmentation problems. The vast majority of the existing studies focus on canonical closed-set conditions, neglecting the intrinsic open nature of the real-world. This limits the abilities of robots and autonomous systems involved in safety-critical applications that require managing novel and unknown signals. In this context exploiting 3D data can be a valuable asset since it provides rich information about the geometry of sensed objects and scenes.With this paper we provide a first broad study on Open Set 3D learning. We introduce a novel testbed for semantic novelty detection that considers several settings with increasing difficulties in terms of category semantic shift, and covers both in-domain (synthetic-to-synthetic, real-to-real) and cross-domain (synthetic-to-real) scenarios. Moreover, we investigate the related Open Set 2D literature to understand if and how its recent improvements are effective on 3D data. Our extensive benchmark positions several algorithms in the same coherent picture, revealing their strengths and limitations. The results of our analysis may serve as a reliable foothold for future tailored Open Set 3D models.

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