Language-Driven Open-Vocabulary 3D Semantic Segmentation with Knowledge Distillation

3D open-vocabulary semantic segmentation is a challenge in the task of 3D scene understanding, as most current models trained on closed-set datasets struggle to effectively identify categories that were not seen during training. To address this, we introduce a framework called LSWKD. It distills knowledge from a pre-trained 3D open-world model, thereby enhancing the alignment between visual and semantic features. Furthermore, we employ Point-discriminative Contrastive Learning to compute caption loss in the teacher model instead of CLIP-style Contrastive Loss in order to let each point be supervised with its all related language captions, which improves the teacher model’s performance. We conducted experiments on ScanNet and S3DIS datasets. The results demonstrate that our approach achieves better hIoU compared with state-of-the-art models. Code will be released at https://github.com/wu39848/LSWKD.