Check Calibration

Check Calibration

The extrinsic camera calibration can be checked after the trial has been analyzed fully. For each view, the 2D representation of the skeleton in that view is compared to the 3D skeleton computed from all views. If the alignment can be improved in at least 30% of the frames by translating the entire skeleton within the 2D image for that view, this information is reported in the dialog. You can then choose to deactivate the cameras that are out of calibration and clear the entire analysis.

This command looks for consistent translational offsets between the 2D skeleton detected for a given view and the 3D skeleton projected on that view, even if the translations are small (on the scale of millimeters).

For trials with relatively minimal motion, this may result in views being detected as out of calibration when they are not. If you think you’ve encountered one of these false positives, try checking a trial with more motion that uses the same calibration file. If the trial with increased motion shows similar translational offsets, then the view is likely out of calibration. If you think that a camera may have been moved inadvertently between trials, you can check the calibration of multiple trials to try to determine when the camera was moved.