FINITE DIFFERENCE AND LEGENDRE SPECTRAL METHOD FOR A TIME-FRACTIONAL DIFFUSION-CONVECTION EQUATION FOR IMAGE RESTORATION

摘要

In this paper, we consider a time fractional diffusion-convection equation and its application for image processing. A time discretization scheme is introduced and a stability result and error estimates are proved. Practical experiments are then provided showing that the fractional approach is more efficient than the ordinary integer one (Perona-Malik). A fully discrete scheme is proposed by using a Legendre collocation method. The convergence of this method is obtained by proving a priori error estimates.