product detection from shelf using Android OpenCV

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Hi all, i'm new about OpenCV but i have some experience in android developing. I'm a Politecnico di Milano Computer Engineer student and I have to graduate soon this year but i have to deploy an image analysis application in which i take a picture from a shelf and then detect all the products in the shelf.

Because our teacher haven't given us a correct documentation (he gave us nothing, only mathematical formulas) I'm here to ask you some tips or documentation that can help me in doing this homework.

thank you all in advance, and sorry if this question sounds a little strange.