Joachim and Carlos,
Thank you both very much for all your help so far with this problem, all of your input is very constructive. I have had look into the CCTV tech and also that researchgate link, and both have provided me with a few more options. At the moment I am organising a visit to... (read more)
This is all very interesting. The solution you describe seems eminently doable and in fact quite cheap. So doable and cheap that it may behoove one to also ask what the higher level vision is, in order to further constrain the solution.
For instance is there a wider... (read more)