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Click-Calib Pattern-Free Extrinsic Calibration for Surround-View Camera Systems
A pattern-free offline extrinsic calibration for four-fisheye surround-view systems: the user clicks a few ground keypoints in the overlapping zones of adjacent cameras, and the camera poses are optimized by minimizing the mean reprojection-distance error of those keypoints directly on the raw fisheye images, giving accurate calibration at both short and long range without physical targets.