Question

I have no idea how to do image recognition, but I have to extract the red-outlined portion from below image and read the graph, supposing the following:

1 – Off Duty
2 – Sleeper Berth
3 – Driving
4 – On Duty

My program should read the graph and, in this example, show a result of 333333333111111222222222444444

Answer 1

Assuming there are no alignment issues, you could divide the task as follows

1. cut the red box rectangle from scan
2. XOR the resulting image with the content of the same region of a blank document (this will attenuate the grid lines)
3. scan in the X direction
4. look for maximum in the Y direction
5. map the found Y values to ranges you require