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15 October 2012 Correction of circular center deviation in perspective projection
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Circular targets are widely used in machine vision. The localization of circle center plays a crucial role in machine vision applications. In the process of camera imaging, the circles change to the ellipses in the image plane of camera because of perspective transformation. The center of ellipse usually does not coincide with the projected center of the circle, leading to a deviation of circle center. Based on perspective transformation and analytic geometry we present a new approach, in which the concentric circular targets are adopted and the true projective position of the circular target can be determined accurately. Both simulation and experiment results show that the proposed method is valid and robust. The true positions of the circular centers can be localized by proposed method without the center deviations.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dong He, Xiaoli Liu, Yongkai Yin, Ameng Li, and Xiang Peng "Correction of circular center deviation in perspective projection", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84991V (15 October 2012);

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