Improved DCT-Based Nonlocal Means Filter for MR Images Denoising

Figure 8

Qualitative comparison of experiment results on PD-weighted image. (a)–(e) are enlarged part of the experiment results with a factor of two.

(a) Enlarged part of the original PD-weighted image

(b) PD-weighted image with 6% Rician noise added

(c) Part of NLM filtered image

(d) Part of UNLM filtered image

(e) Part of UNLM-DCT filtered image

(f) NLM residuals

(g) UNLM residuals

(h) UNLM-DCT residuals