New answers tagged calculations
If you had a finer grid, you could measure the object using the image of the ruler, even if it's seen in a fun-house mirror. If the cm marks are 1t pixels apart on one end and 8 px apart on the other end, it's no sweat if you count N actual marks in the image across the object. If you don't have the ruler adjacent to the object, but measure various featues ...
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