I have problem that when I export the file out, I am not sure that they require pixel or centimeter for the x and y coordinate and how we can change it. Can anyone help me?
We, my group and I, haven't figured it out yet but I believe that the optimal way to save would to be to have your x and y's stored as cm's from origin - that should be set as part of your calibration.
I think It does require in cm
Yes, the exported data should be in cm from the origin. This is fairly simple math:
outputX = (xInVideo - originX) / xPixelsPerCm
and similarly for the y coordinate.