On a cross-diffusion system arising in image denoising

Abstract

We study a generalization of a cross-diffusion problem deduced from a nonlinear complex-variable diffusion model for signal and image denoising.We prove the existence of weak solutions of the time-independent problem with fidelity terms under mild conditions on the data problem. Then, we show that this translates on the well-posedness of a quasi-steady state approximation of the evolution problem, and also prove the existence of weak solutions of the latter under more restrictive hypothesis.We finally perform some numerical simulations for image denoising, comparing the performance of the cross-diffusion model to other well-known denoising methods.