Before revision:  framework powered by adding the Total Variation regularizer which promotes gradient-sparsity of the solution . Differently from other existing approaches, we solve the arising minimization problem by using the well known Alternating Direction Method of Multipliers (ADMM)
After revision:  framework and we propose to combine it with a space-variant Total Variation regularizer which promotes gradient-sparsity of the solution . Differently from other existing approaches, we solve the arising minimization problem by using the well known Alternating Direction Method of Multipliers (ADMM)