I am trying to calculate the length and width of objects using a camera. The camera (90° angle from the top) and the background is fixed.
As an example I take a picture from a US quarter from a distance of 10 inches. To calibrate I calculate how many pixels the US quarter has. When I stack 25 quarters will I still be able to get an accurate measurement or is this not possible?
Also would it work any better if I have an image from the top and one from the front?
I appreciate any help :)