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Camera resectioning is the process of estimating the parameters of a pinhole camera model approximating the camera that produced a given photograph or video. Usually, the pinhole camera parameters are represented in a 3 × 4 matrix called the camera matrix.This process is often called geometric camera calibration or simply camera calibration, although that term can also refer to photometric camera calibration.The classic camera calibration requires special objects in the scene, which is not required in camera auto-calibration.
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