An Alternating Direction Method for Mixed Gaussian Plus Impulse Noise Removal

Figure 4

Top: Lena image blurred with out-of-focus kernel of radius 3 and then corrupted by Gaussian noise with 𝜎=5 and salt-and-pepper noise with 𝑠=30%, 50%, 70%, and 90%, respectively. The second line: results restored by MNID-ADMM (𝛼₁=0.9,𝛽₁=𝛽₂=𝛽₃=0.05). The third line: Lena image blurred with out-of-focus kernel of radius 3 and then corrupted by Gaussian noise with 𝜎=5 and random-valued noise with 𝑟=25%, 40%, 55%, and 70%, respectively. Bottom: results restored by MNID-ADMM (𝛼₁=0.9, 𝛽₁=𝛽₂=𝛽₃=0.05).