Where is original point of Z axis in a stereo vision system?

[lizhuo_lin]

Hello, everyone

I use LabVIEW Stereo Vision module. After I calibrate my stereo vision system, I want to verify the accuracy of my system. I can get every point`s depth in my picture, but where is my original point of Z axis? 

In the newest NI Vision Concepts Help, it is written that  NI Vision renders 3D information with respect to the left rectified image such that the new optical center will be at (0, 0, Z) position. Is the original point of Z axis is on the CCD of left camera or the optical center of my left camera`s lens?

So anyone can help me ?

[Klemen · Accepted solution]

Hello,

I would say that the coordinate system origin is at the optical centre, that is the camera's projection centre.

So, yes, the optical centre of the left camera's lense. This seems most logical to me...

Best regards,

K

[lizhuo_lin]

Thanks! Klemen.