300 988 images, 4 types of mask worn, 75 247 people.Each item contains:
- person's age
- user ID
TYPE 1 - There is no mask on the face.
TYPE 2 - The mask is on, but does not cover the nose or mouth.
TYPE 3 - The mask covers the mouth, but does not cover the nose.
TYPE 4 - The mask is worn correctly, covers the nose and mouth.