How can you recognize anomalies on road signs?

Question

Pattern recognition

There is a task to recognize that the road sign is partially blocked (ideally by a tree branch)
How can this be implemented?
Maybe there are some similar studies with the same popular cats?

Answer 1

1. Detect the displacement vectors of the front objects in adjacent frames.
2. Remove shadows, restore light: normalize dark moving areas.
3. Fill with the nearest pattern or background what will remain covered at any angle by the front objects.
4. Restore the plane in space.
5. Turn frontally.
6. Check with the standard.