With the Self-Calibration functionality you have the possibility to adjust the coordinate system and the camera calibration of a stereoscopic PIV setup so that the plane z=0 mm will be adjusted exactly in the middle of the laser light sheet. This feature allows to eliminate potential errors in the vector calculation due to misalignment of the calibration plate position and light sheet position.
The self-calibration is using the simple assumption that images taken at the same time by camera 1 and camera 2 should contain the identical information after the corresponding image correction has been applied. Usually you nd small discrepancies due to de ections of the calibration plate position.