Suppose I want to take the dimensions of an object of negligible width on a flat surface from a photograph and am able to calibrate in the sense that I know the distance per pixel of some line drawn on the object via doing real world measurements.
How could I go about getting the other dimensions without manually finding a pixel to distance ratio or measuring each individual desired dimension irl?
Is there some program that can use this photograph to craft a 2D outline of it that I might then use with CAD?
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