Thread Subject:

How to Identify 3D position of a point from uncalibrated image.

Hi all,

I am working upon camera calibration and have built up understanding towards projective geometry and DLT method to find out camera parameters. As we know that for calibration we need to have Euclidean structure of the object (i.e. 3D poistion of control points must be well-known) before we apply DLT.

Can somebody tell me.. how to find out the 3D position of points in a scene for which I can calculate calibration parameters.

Regards!
God Bless You.

Hi Ali,
You can find the position of the 3D points, using, for example, a Planar Chessboard. You should define the origin (0,0,0) at the corner of the chessboard and the positions of the points at it would be correspondent to the size of the squares of the plane. The points will be the corners of every square inside the chessboard.
An important thing: the points at the chessboard will have the Z coordinate equals to 0 , because the origin (0,0,0) is at the same plane of the points...

Carlos
carlosjunior@gmail.com


"Ali Kazmi" <s.m.a.m.kazmi@gmail.com> wrote in message <hsc62s$aks$1@fred.mathworks.com>...
> Hi all,
>
> I am working upon camera calibration and have built up understanding towards projective geometry and DLT method to find out camera parameters. As we know that for calibration we need to have Euclidean structure of the object (i.e. 3D poistion of control points must be well-known) before we apply DLT.
>
> Can somebody tell me.. how to find out the 3D position of points in a scene for which I can calculate calibration parameters.
>
> Regards!
> God Bless You.