1. MILAN: Milli-Annotations for Lidar Semantic Segmentation
- Author
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Samet, Nermin, Puy, Gilles, Siméoni, Oriane, and Marlet, Renaud
- Subjects
Computer Science - Computer Vision and Pattern Recognition - Abstract
Annotating lidar point clouds for autonomous driving is a notoriously expensive and time-consuming task. In this work, we show that the quality of recent self-supervised lidar scan representations allows a great reduction of the annotation cost. Our method has two main steps. First, we show that self-supervised representations allow a simple and direct selection of highly informative lidar scans to annotate: training a network on these selected scans leads to much better results than a random selection of scans and, more interestingly, to results on par with selections made by SOTA active learning methods. In a second step, we leverage the same self-supervised representations to cluster points in our selected scans. Asking the annotator to classify each cluster, with a single click per cluster, then permits us to close the gap with fully-annotated training sets, while only requiring one thousandth of the point labels.
- Published
- 2024