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Red or Green??

Questions, problems, comments and tips regarding the 3d scanning process.

Red or Green??

Postby osmo25 » Fri Apr 13, 2007 9:49 pm

I have been reading through the topics and would like to know what will give better results, a red or green laser? Also I have read that the thinner the laser line the smoother your scans will be. How do you determine that before purchasing a laser? Or is it just through trial and error?
Thanks
osmo25
 
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Postby WalterMo » Sat Apr 14, 2007 1:25 pm

Hallo osmo25,
I would prefer a green laser if you plan to use a color camera, e.g. a WebCam. For a greyscale camera it's all the same.
If you take a look on the surface of the photosensitive chip of the camera you will see that 25% of the pixels are sensitive to red, 25% to blue and 50% to green. Working with David with a red laser only a quarter is directly illuminated, the remainder is interpolated from the red-sensitive pixels.
Unfurtunately the price for a green line laser is about twice the price of a red one.
Anyway it should be possible to adjust the focus to get a line as thin as possible.

Walter
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Postby osmo25 » Sat Apr 14, 2007 8:18 pm

Thanks again for all the info. Cant wait to get started and post some results. :D
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