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pixel change detection


Fair warning, total noob question. I'm curious to see if OpenCV is even the correct library for this use case.

The user would like to zoom into a section of the footage, an "area of interest" to quickly see all the "clips" of when any activity took place within said "area of interest".

On a primitive level, this is essentially pixel change in a localized area, so I'm not sure machine learning or CV is necessary - but I'm open to whatever the simplest solution is, especially if something out of the box already works.

But ideally, we'd like to train a model so it knows what is "normal" activity (i.e. mailman), and what isn't (i.e. vandal).

Any feedback on the simplest way to make this happen is greatly appreciated!

Thanks, Nick