  In the era of big data and large models, automatic annotating functions for
multi-modal data are of great significance for real-world AI-driven
applications, such as autonomous driving and embodied AI. Unlike traditional
closed-set annotation, open-vocabulary annotation is essential to achieve
human-level cognition capability. However, there are few open-vocabulary
auto-labeling systems for multi-modal 3D data. In this paper, we introduce
OpenAnnotate3D, an open-source open-vocabulary auto-labeling system that can
automatically generate 2D masks, 3D masks, and 3D bounding box annotations for
vision and point cloud data. Our system integrates the chain-of-thought
capabilities of Large Language Models (LLMs) and the cross-modality
capabilities of vision-language models (VLMs). To the best of our knowledge,
OpenAnnotate3D is one of the pioneering works for open-vocabulary multi-modal
3D auto-labeling. We conduct comprehensive evaluations on both public and
in-house real-world datasets, which demonstrate that the system significantly
improves annotation efficiency compared to manual annotation while providing
accurate open-vocabulary auto-annotating results.
