This work develops extensions of Steffensen's method to provide new tools for
solving the semi-blind image reverse filtering problem. Two extensions are
presented: a parametric Steffensen's method for accelerating the Mann
iteration, and a family of 12 Steffensen's methods for vector variables. The
development is based on Brezinski inverse and geometric product vector inverse.
Variants of these methods are presented with adaptive parameter setting and
first-order method acceleration. Implementation details, complexity, and
convergence are discussed, and the proposed methods are shown to generalize
existing algorithms. A comprehensive study of 108 variants of the vector
Steffensen's methods is presented in the Supplementary Material. Representative
results and comparison with current state-of-the-art methods demonstrate that
the vector Steffensen's methods are efficient and effective tools in reversing
the effects of commonly used filters in image processing