Before revision:  In addition, we can incorporate a box constraint that is reasonable for imaging applications . Numerical schemes are based on the alternating direction method of multipliers (ADMM), and we provide the convergence analysis of all the proposed algorithms (constrained/unconstrained and with/without the box constraint ).
After revision:  In addition, we incorporate a box constraint that is reasonable for imaging applications . Numerical schemes are based on the alternating direction method of multipliers (ADMM), and we provide the convergence analysis of all the proposed algorithms (constrained/unconstrained and with/without the box constraint ).