To try and keep it simple, right now our Computer Vision works by identifying stark contrast between the paper and the floor as well as the paper and the foot to figure out two things:
1. Where the paper is. Once it finds it, it sets the scale.
2. Where the foot lies on the paper (how much space between the 1st or 2nd toe and the end of the paper)
So, if the paper has print on the side that is facing up, our Computer Vision has a tough time with both of those steps, which are critical in calculating your exact foot size.