Such a dataset can be used to train models for computer vision tasks. In conditions of exacerbation of the coronavirus situation, such a model will help to monitor the degree of compliance with the mask regime in crowded places and provide more accurate statistical information.
Color map and values:
1. mask_on - the mask is on (green)
2. mask_off - the mask is removed/lowered (yellow)
3. no_mask - there is no mask (red)
4. mask_unknown - unclear values (blue)