3d scanning using structured light

• Previous message: Sreekanth: "Need Urgent help !!!!"
• Messages sorted by: [ date ] [ thread ]

Date: Sun, 22 Aug 2004 16:59:26 +0100

Hello, I am trying to develop a 3d scanner using a light stripe projector, a
camera and a turntable but I am having difficulties and I was
wondering if anyone could help me. The proccess that I am following is:

    1. Calibrate camera, using the center of my turntable as the world
origin

    2. Find the center of the light stripe for each scanline in image
coordinates

    3. Find the 3D location of each stipe point (in camera coordinates)
using the equations:
                               xc = (tan(a) * b * x) / (f + tan(a) * x)
                               yc = (tan(a) * b * y) / (f + tan(a) * x)
                               xc = (tan(a) * b * f) / (f + tan(a) * x)
           where b , the distance between the projector and the camera ;

    3. Convert the camera coordinates into world coordinates using the
calibration info

     3. For each position of the turntable , rotate the acquired coordinates
about the y axis:

                               xw' = zw * Sin(rotation) + xw * Cos(rotation)
                               yw' = yw
                               zw' = zw * Cos(rotation) - xw * Sin(rotation)

Is there something wrong with the steps I am following ? If not, I assume
that the error is the conversion of camera to world coordinates.Can anyone
help me with that?

Thanks

• Previous message: Sreekanth: "Need Urgent help !!!!"
• Messages sorted by: [ date ] [ thread ]