Answer: 2D to 3D

[CJMCE@xxxxxxxxxxxxxxxx]

To:	IN%"photo-3d@xxxxxxxxxxxxxxx"
Harald  Volz said:

>Having two 2-D-images of the same human face ( for example one rotated
>by 25 degrees), it should be possible to reconstruct the 3D-model of
>the head.
>But: You need the correspondence of each point of this face and
>the camera parameters used for the images.
>We try to find the correspondence between the two images automatically.
>Maybe there ore other ways to reconstruct the 3D-structure.

>We are looking for hints, algorithms, or source-code concerning this
>issues.

If your software cannot automatically find common points on skin, perhaps you
should PUT points on the skin (ink or project them optically like with a
slide projector).  When I do anthropometric work on humans, I just use ink
because I don't need that many points and it easily washes off.  (White
people get black felt-tip pens, black people get white typewriter correction
fluid.) For more elaborate applications where researchers need to model a
surface, the common method is to project a dot pattern.  If you're using only
one camera, you will have to rotate the camera so that the points won't move
with respect to your subject.  You might consider a series of lateral
displacements such that you obtain a series of stereopairs.  If you want the
minimum number of images highly convergent views would be necessary.  What
are you going to do about hair?  My solution was extremely short hair cuts. 
I was not very popular with the subjects, but it worked rather well...

If you have the ability to measure the conjugate points to obtain x,y image
coordinates, I have the software to do the photogrammetric computations for
X-Y-Z coordinates of the points.  It runs on a PC - 486DX or better.

You can't have the source code, but I sell the executable for $2,000.00(U.S.)

Clifford J. Mugnier  (cjmce@xxxxxxx)
Topographic Engineering Laboratory
Department of Civil & Environmental Engineering
University of New Orleans
New Orleans, Louisiana  70148
Voice: (504) 286-7095
FAX:         286-5586



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End of PHOTO-3D Digest 1243
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