Improved DCT-Based Nonlocal Means Filter for MR Images Denoising

Figure 3

Samples of MR images with Rician noise. (a) to (c) are original images from the BrainWeb Database, (d)–(f) are noisy images of (a)–(c) with 6% Rician noise added.

(a) T1-weighted image

(b) T2-weighted image

(c) PD-weighted image

(d) 6% Rician noise corrupted T1-weighted image

(e) 6% Rician noise corrupted T2-weighted image

(f) 6% Rician noise corrupted PD-weighted image