Why not take a picture? if you are careful to keep the camera perpendicular to the surface this should work well, then you can scale and crop as necessary. Also, if the flash interferes with the picture, turn off the flash and place a light off center to light the surface and not reflect. I have done this several times, most recently to rescale a game board, with very good success.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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