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Hi, Simon!

Yes, you can try chessboard pattern to calibrate camera with bird's-eye view, but asymmetric circles grid pattern usually provides less average re-projection error. Look through the "Camera calibration With OpenCV" tutorial for more experience.

To achieve good results, pass

CV_CALIB_RATIONAL_MODEL

into flags combination in calibrateCamera() function and play with fixing or leaving free radial distortion coefficients (use appropriate flag combination). I had reliable results with fixed k5, k6 coefficients and leaved free principal point.

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fixed link to calibrateCamera

Hi, Simon!

Yes, you can try chessboard pattern to calibrate camera with bird's-eye view, but asymmetric circles grid pattern usually provides less average re-projection error. Look through the "Camera calibration With OpenCV" tutorial for more experience.

To achieve good results, pass

CV_CALIB_RATIONAL_MODEL

into flags combination in calibrateCamera() function and play with fixing or leaving free radial distortion coefficients (use appropriate flag combination). I had reliable results with fixed k5, k6 coefficients and leaved free principal point.