ya but in this case, wouldn't you have to program a really complex loss function, to track a lot of things like lighting, edge detection, granularity, video compressions artifacts etc.

basically at this point you would have a lot of if-else statements, like a "Expert System" AI in the 80s.

so much so that it would be better to use a NN to replace the loss/error/verification function instead of coding it by hand?