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Bad Camera Calibration

Hi Guys,

I'm trying to calibrate the integrated Camera of my notebook.

I'm using a 9x6 cheeseboard with a length of 300mm. It's printed on a Konica bizhub 452c and fixated on a drawingboard.

Using the tutorial-Code I'm getting strange undistorted Pictures, which shows that the calibration is bad (example below).

image description

I have feed about 70 pictures in the algorithm (different positions etc.) trying to get trainingpoints as far as possible to the picture edges.

I have tried for days to get an expectable calibration, but I'm only able to minimize the hole-effects on the sides.

Any Help would be appreciated.

If they are need I will provide the calibration-pictures.

regards

Moglei