Image Denoising via Nonlinear Hybrid Diffusion

Figure 6

Lenna image (300×300). (a) Noisy image corrupted by Gaussian noise for 𝜎=20. (b) Original image. (c) Our algorithm by AOS, 𝑘=1, 𝜏=2 (4 steps). (d) Our algorithm by PMS, 𝜏=0.25 (47 steps). (e) PM algorithm, 𝐾=5, 𝜏=0.25 (55 steps). (f) TV algorithm, 𝜏=0.1 (182 steps).

(a) Noisy: 𝜎=20, PSNR=22.09

(b) Original

(c) AOS: PSNR=29.72, MAE = 6.08

(d) PMS: PSNR = 29.58, MAE = 6.15

(e) PM: PSNR = 28.81, MAE = 6.46

(f) TV: PSNR = 29.15, MAE = 6.38