A neat photographic method for capturing 3d surface

[bill.young]

These techniques are getting better and better...

http://www.hothardware.com/News/Capt...-Flash-Camera/

[handh]

That's pretty neat.

[nschlee]

Where can we get the software that compares the two images and generates the ht. map???? :-)

[dana_swift]

Makes me want to write something!

Combining those techniques, with the well known mathematics of optics and photogrammetry a very nice 3D rendering should be possible. If it just needs to "look good" for a carving, that would be a simple method of getting it.

Hmm this is sounding like fun!

D

[jseiler]

If you are looking for a way to get shallow relief from simple flash photography, check this out:

http://zarria.net/nrmphoto/nrmphoto.html

I did some playing around...

http://www.talkshopbot.com/forum/mes...tml?1192018777

The results can be spectacular. Its not a laser scan, but it can get you some pretty artistic shallow reliefs really fast (not particularly accurate, but very artistic). I wish I had time to experiment more, but I ran into a brick wall of not having the right software (GIMP vs photoshop) and not having the right project to pay for the investment in better software (necessity is the mother of investment?) Maybe someone with some spare time and photoshop would like to run with this and show us something really cool.

John

[ron_varela]

Here is something that has been around a few years and worked in our furniture restoring when we did antiques.

http://www.david-laserscanner.com/

Ron

[dana_swift]

Bill & John if you took the bumpmaps created with the technique used in the article at:

http://zarria.net/nrmphoto/nrmphoto.html

Then use Maple, Matlab, MathCad or some similar program to compute the blue (Z) component of each vector. Knowing that 1 = X^2 + Y^2 + Z^2. (I'm a Maple user, and John, I saw you have Matlab.)

You should be able to generate excellent normal maps. Converting those to 3D relief maps could be done using any of several methods.. perhaps the most simple for non-critical reliefs is to take the dot product of the corrected normal vector with the "k" unit vector in Z. I can think of others which would result in a more true relief.

The ideas are gaining refinement- the first step to serious inspiration.

D

[bill.young]

Dana,

Have you seen this pdf that explains the first photographic method in more detail...

http://aig.cs.man.ac.uk/publications...ssWard2008.pdf

(it's all Greek to me!)

Bill

[nschlee]

Go for it! Dana :-)

Neal

[ron_varela]

Here are the results I made from the links provided by Bill and Dana.
I used the pictures of the peanuts and the method used by Bills link, this might not be for the average shopbotter.

Ron


33703.jpg

33704.jpg