Improving Spatial Adaptivity of Nonlocal Means in Low-Dosed CT Imaging Using Pointwise Fractal Dimension

Figure 2

Noisy test images and reconstructed images.

(a) Noisy image with 𝑓_𝑖=2.5,𝑇=2𝑒+4

(b) Reconstructed image from (a) using NLMs

(c) Reconstructed image from (a) using PWBCD-NLMs

(d) Noisy image with 𝑓_𝑖=4.0,𝑇=2𝑒+4

(e) Reconstructed image from (d) using NLMs

(f) Reconstructed image from (d) using PWBCD-NLMs