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7 September 2010 Center location error correction of circular targets
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Circular targets are commonly used in vision measurement and photogrammetry. Due to the asymmetric projection, the geometric centroid of the ellipse projection and the true projection of the target center are not identical, which leads to a systematic center location error. A method to correct the center location error is presented in this paper. Surface normal directions of circular targets are determined by camera calibration in advance. Then the correction values of the geometric centroids are calculated with space analytic geometry. The experimental results show the improvement of accuracy can be achieved after error correction by our method.
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Yongkai Yin, Xiaoli Liu, Ameng Li, Chenggong Zhang, Dong He, and Xiang Peng "Center location error correction of circular targets", Proc. SPIE 7798, Applications of Digital Image Processing XXXIII, 779824 (7 September 2010);

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