It's generally hard enough persuading someone that you can measure something from a picture - also telling them that they can't use 'normal' computer software is even harder.
Of course back in the day, when it had to be a Sparc station crammed full of custom i860 boards it as even harder!
they don't teach you that the defualt opencv built with vs will clash with Qt libs built with mingw but the ing system won't tell you this!