Camera extrinsics optimization step 3 failed

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Explanation

This error message arises when the chessboard calibration algorithm is unable to calculate the position and orientation of the cameras relative to the chessboard. More than one chessboard may have been detected in the calibration trial videos, which can be caused by extra chessboards present in the capture volume or mirrors positioned around the capture volume.

Possible Solutions

1. Reduce the Frame Grab Step.

If the chessboard was detected in too few frames to be calibrated due to a high Frame Grab Step value being used, it may be possible to calibrate the system with a lower Frame Grab Step value. Lower the Frame Grab Step value and run the calibration again.

1. Collect a new calibration trial.

If the camera system has not be taken down or modified since the data were collected and the data were collected relatively recently (within 48 hours), a new calibration trial can be recorded. Address the source of the problem (e.g. remove extra chessboards or cover mirrors) and collect a new calibration trial.