Optical Boundary Reconstruction With Visible Camera in the EXL-50 Spherical Tokamak - Guo, D.; Xie, H.S.; Bai, W.; Liu, W.J.; Peng, Y.M.; Song, X.M.; Tao, R.Y.; Chen, B.; Liu, B.; Deng, B.H.; Shi, Y.J.; Yuan, B.S.; et al. (IEEE Transactions on Plasma Science, Plasma Science, IEEE Transactions on, IEEE Trans. Plasma Sci., 2021)