I am looking to get a camera to recognise and track alphabetical letters. I am only looking to recognise 4 letters, TACG (the DNA bases) and these would be written on a block that the camera can see.

I have looked at using reactivision and including a letter beside the fiducials but it would be great if I could just use a letter on its own and get rid of the fiducial altogether.

Does anyone know if this is possible?