Estimating product dimensions basis camera images

I have camera images (top view) of boxes. I will be giving height as input. I will also be sharing some sample images of empty platform and known objects for you to help the algorithm learn. As an output, 1. I need the code to detect the edges of the object 2. calculate length and width of the object, despite the orientation of the box 3. Phase II - read barcode/s which may be there on the box