From: Brain MR image denoising for Rician noise using pre-smooth non-local means filter
PSENLM1 | PSENLM2 |
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(1) Extract background | (1) Transform noisy image by the forward variance-stabilization transformation |
(2) Compute the noise variance σ 2 according Eq. (5) | (2) Smooth the transformed image |
(3) Compute the squared magitude of noisy image | (3) Compute the weigh term from the smoothed image |
(4) Smooth the squared magitude of noisy image | (4) Obtained final result by the inverse variance-stabilization transforming of the NLM denoising result |
(5) Compute the weigh term from the smoothed image | |
(6) Correct bias by subtracting 2σ 2 from the NLM denoising result. The final result is obtained by squared root of the bias correction |