How to solve the problem of recognition of handwritten drawings?

Question

Neural networks

How can you solve the problem of recognizing drawings drawn by hand?
The drawings are something like this:

At the output, you need to get a list of sides and diagonals with lengths.
How would you solve such a problem?

Answer 1

Separately. Vectorize lines (even a neuron is not needed here) and recognize numbers. Well, then glue them to the nearest line (here, in general, pure geometry).