Adjust error message when extrinsic calculation could not be calculated
There was a problem with the calculation of the extrinsic calibration. When selecting points there was the following error message:
They tried to do it with many different points, as the error message says, that other points should be selected. We later found out, that the problem was caused by a wrong intrinsic calibration (which could not really be seen because there was nearly no distortion).
Maybe the message can be adjusted to say something like "select other points and check for correct intrinsic calibration".