Smoother

MultiresolutionImageProcessing1)Smoother: In numerical analysis, a smoother is a method to damp high frequencies. In the sense of multigrid methods, smoothers are used to reduce high-frequency components of the error that arises when approximating the solution of PDEs. Commonly used smoothers include the Jacobim method as well as the Gauss-Seidel method. Both methods are iterative solvers of linear systems of equations Ax = band work by calculating a new approximation x(m+1) from the previous approximation x(m), the matrix A and the right-hand side b.