Calibration of digital camera IOP using radial alignment constrain and vanish point geometry

Gang Xu; Zenglai Dong; Jiejun Wang

doi:10.1117/12.896196

8 July 2011 Calibration of digital camera IOP using radial alignment constrain and vanish point geometry

Gang Xu, Zenglai Dong, Jiejun Wang

Proceedings Volume 8009, Third International Conference on Digital Image Processing (ICDIP 2011); 80092F (2011) https://doi.org/10.1117/12.896196
Event: 3rd International Conference on Digital Image Processing, 2011, Chengdu, China

Abstract

This paper presents our research on calibrating IOP of digital camera with mono-view. First, the Radial Alignment Constrain (RAC) from Tsai's two-stage calibration is outlined and extended to handle with camera principle point parameters. Second, we relate principle point to other camera parameters by means of two vanishing points from the perspective projection of group lines, parallel to World Coordinate System X, Y axis, respectively, and with the relation, the function-dependence among parameters within the equation derived from extended RAC are eliminated. Third, based on the extended RAC, a new nonlinear equation for IOP calibration purpose is formulated and optimally solved with Least Square technique as well as initial value for parameters are determined. Finally, a set of stimulated images generated with virtual plane grid lines and known camera parameters are used for calibration experiment. The comparison of proposed approach with Tsai's two-stage calibration is also given in this paper and valuable conclusions are conducted as well.

Citation Download Citation

Gang Xu, Zenglai Dong, and Jiejun Wang "Calibration of digital camera IOP using radial alignment constrain and vanish point geometry", Proc. SPIE 8009, Third International Conference on Digital Image Processing (ICDIP 2011), 80092F (8 July 2011); https://doi.org/10.1117/12.896196

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