Image Denoising via Nonlinear Hybrid Diffusion

Figure 3

Synthetic image (128×128) (a) Noisy image corrupted by Gaussian noise for 𝜎=20. (b) Original image. (c) Our algorithm by AOS, 𝑘=0.02, 𝜏=2 (11 steps). (d) Our algorithm by PMS, 𝜏=0.25 (62 steps). (e) PM algorithm, 𝐾=5, 𝜏=0.25 (90 steps). (f) TV algorithm, 𝜏=0.1 (360 steps).

(a) Noisy: 𝜎= 20, PSNR = 22.08

(b) Original

(c) AOS: PSNR = 39.00, MAE = 1.86

(d) PMS: PSNR = 40.70, MAE = 1.62

(e) PM: PSNR = 39.74, MAE = 1.78

(f) TV: PSNR = 37.08, MAE = 2.52