A Preconditioning Technique for First-Order Primal-Dual Splitting Method in Convex Optimization

Figure 4

(a1)–(a3) are the noisy image of “Barbara” with noise levels , , and , respectively; (b1)–(b3) are the denoised image by Algorithm 1; (c1)–(c3) are the denoised image by our proposed Algorithm 4.