In this article we study a continuous Primal-Dual method proposed by Appleton and Talbot and generalize it to other problems in image processing. We interpret it as an Arrow-Hurwicz method which leads to a better description of the system of PDEs obtained. We show existence and uniqueness of solutions and get a convergence result for the denoising problem. Our analysis also yields new a posteriori estimates. Acknowledgements. I would like to warmly thank my PhD advisor Antonin Chambolle for suggesting me this problem and for our fruitful discussions. This research was partially supported by ANR project MICA (20062009).
M. Goldman