A Calibration Method based on B-spline Modeling for Fish-Eye Lenses

• Main Authors: Jie-Shou Lu, 陸界守
• Other Authors: Tsung-Ying Sun
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/17388980711780666510

碩士 === 國立東華大學 === 電機工程學系 === 101 === Common methods for calibrating fish-eye lenses are to construct distortion function based on mathematical method that is used to model the optical system. Adjusting parameters of distortion function can make various calibrated results; however, the distortion function based on polynomial function is insufficient to deal with all fish-eye lenses. This thesis develops an adaptive mechanism to establish distortion function based on B-spline function. This thesis presents a Particle Swarm Optimization (PSO) approach for adjusting the control points of B-spline function. Furthermore, this thesis also uses initial adjustment mechanism to restrain the variance of PSO. In adjusting process, this thesis employs the line data in correction pattern as the reconstruction performance. The experiment results in this thesis showed that the proposed method for establishing distortion function can effectively reconstruct the lines in correction pattern, and also has better reconstruction performance than polynomial function and equidistance projection equation.