The Gamma-limit for singularly perturbed functionals of Perona-Malik type in arbitrary dimension

In this paper, we generalize to arbitrary dimensions a one-dimensional equicoerciveness and Γ-convergence result for a second derivative perturbation of Perona-Malik type functionals. Our proof relies on a new density result in the space of special functions of bounded variation with vanishing diffuse gradient part. This provides a direction of investigation to derive approximation for functionals with discontinuities penalized with a «cohesive» energy, that is, whose cost depends on the actual opening of the discontinuity.