Fig. 1. Design of the calibration fan

Fig. 2. Image acquisition of calibration fan

Fig. 3. Internal parameter calibration model of line-scan camera

Fig. 4. The process of parameter calculation and optimization

Fig. 5. Expectation, variance and absolute error of camera intrinsic parameter error

Fig. 6. Cause analysis of parameter solution instability

Fig. 7. Test scene

Fig. 8. The results of 13 fan bones solving \begin{document}$ {y_0} $\end{document} and \begin{document}$ f $\end{document}. (a) The result of \begin{document}$ {y_0} $\end{document}; (b) The result of \begin{document}$ f $\end{document}

Fig. 9. The proportion of re-projection error distribution