Comments on “Robust circularly orthogonal moment based on Chebyshev rational function” [Digit. Signal Process. 62 (2017) 249-258]

Comments on the recent work of Guo et al. [1] are presented, in order to correct the erroneous equations. The corrected equations of the Chebychev rational moments, for gray-level images, are presented. In addition, one numerical experiment is performed to ensure the validity of the corrected equations.