Improved DCT-Based Nonlocal Means Filter for MR Images Denoising
Figure 10
UNLM-DCT filter on a real T1-weighted sagittal MR image of the knee with an estimated noise standard deviation of 4.2. From left to right: original image, denoised image, and the difference image between them. Whole image is shown on top, and a detail of the rectangular region with red border is exposed on bottom.
