As a final step of calibration, you need to manually adjust scale parameter, to make distances between cameras and cameras' height over ground correspond to actual.
Here's the guideline:
http://wiki.ipisoft.com/User_Guide_for_ ... _referenceBefore you do this step, please make sure you calibration was correct. One "Scene" tab for each camera you can see reprojection errors, and camera misdetection percentage. Calibration is good, in reprojections errors are within 1 pixes, and marker misdetection is within 10%.
Also make sure that all floor points you marked are seen in all cameras. If not, unmark all points and mark floor points seen in all cameras.