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18 August 2011Camera calibration method based on circular ring
A novel camera calibration method based on circular ring is proposed in this paper. It has been proven that the first
two columns of calculated point transfer homography mapping from the circular ring plane to the image plane have one
isometric ambiguity. But in that case the restriction of homography on the IAC (the image of absolute conic) is still
tenable, so the restriction could be applied to the calibration of the internal camera parameters. The ambiguity of the first
two columns of homography directly results in the isometric ambiguity of the rotation matrix which can be explained in
geometry as the isotropy of circular ring. But the third column of homography has no ambiguity, so the unique of which
could not lead to the ambiguity of the translation vector. The external camera parameters can be calibrated using circular
ring while there is a discrepancy of isometric transformation of rotation matrix within the model plane, which is most
distinguished from the principle of the other plane-based calibration method such as points, lines and multiple conics.
The proposed method has two distinctly superiority over the calibration based on coplanar points or lines: Better noise
immunity because of the global property of the circular ring feature, and automatic calibration because the image
matching of the circular ring feature is much easier compared with the one of points or lines. Both simulation and real
data are used to prove the correctness, high accuracy and robustness of our calibration method.
Yun Yuan andZhaokun Zhu
"Camera calibration method based on circular ring", Proc. SPIE 8194, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, 81942S (18 August 2011); https://doi.org/10.1117/12.900863
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Yun Yuan, Zhaokun Zhu, "Camera calibration method based on circular ring," Proc. SPIE 8194, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, 81942S (18 August 2011); https://doi.org/10.1117/12.900863