So I have an IP camera setup that takes a photo of a shelf. On this shelf could be hundreds of items.

What I would like to do is every 20mins the system will take a photo of the shelf. The camera is fixed, and the shelf is fixed so the only differences will be where an item has been removed from the shelf, or added to the shelf.

Is there a way I can compare two photos, and find/highlight on the photo where there is a difference as well as a count of how many differences have been found ?

C# code