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Scan the image as a high res black and white image, then run a few of the filters on it . maybe an edge detection, then run a bmp to vector program on it (maybe one of the shockwave/flash making programs ), tidy it up and load it into autocad..
scaling the vectors down and up will get it to snap lines a little more.
It'll take time to get a process down, but i bet you could get it down pretty close., without a really expensive 3d scanner.
A digicam and lots of light might work better since you can make a rig thats fixed and slot the wood in, make it a straighter source.
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