It seems to be a bug in opencv-contrib: cv2.omnidir.calibrate - Assertion error(-215) - Python 路 Issue #3161 路 opencv/opencv_contrib 路 GitHub
Please if someone has a fix/ other solution for calibrating cameras with large FOV~190 degrees, let me know 
It seems to be a bug in opencv-contrib: cv2.omnidir.calibrate - Assertion error(-215) - Python 路 Issue #3161 路 opencv/opencv_contrib 路 GitHub
Please if someone has a fix/ other solution for calibrating cameras with large FOV~190 degrees, let me know