Anomaly track: general anomaly segmentation in full street scenes
Obstacle track: obstacle segmentation with the road as region of interest
The pixel-level annotations of both datasets include three classes:
The 19 evaluation classes from Cityscapes serve as basis to judge whether an object is anomalous or not. We assign image regions to the void class if they cannot be assigned to any of the Cityscapes classes and also do not belong to the objects / regions of interest, i.e. they are neither anomaly nor obstacle.