Need some concept explainers

I am a person trying to understand things, as my nephew wants to study in the area of ‘image processing’. In these times of high debt for college education(his mum does not have the time to do all this), I want to make sure it has a future. College departments do not really have space for such things. I understand his wish to explore, but occasionally we need to understand too. I wish there were good concept explainers for fields in image processing, like this one for z-scores. I am trying to understand his interest. He is not very capable of conveying his interest to us and the arguments are draining. There is so much information here, but so little for occasional visitors. Sorry if this is not the right place for this note. Thanks.

Have you checked the section ‘Applications’ in

Also very related is

You are asking if this technique has a future.