Research Article

Improved DCT-Based Nonlocal Means Filter for MR Images Denoising

Figure 7

Qualitative comparison of experiment results on 6% Rician noise corrupted T1-weighted image. The quality of the proposed filter can be noticed in both filtered image and the corresponding residuals.
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(a) T1-weighted image with 6% Rician noise added
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(b) NLM filtered image
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(c) UNLM filtered image
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(d) UNLM-DCT filtered image
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(e) NLM residuals
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(f) UNLM residuals
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(g) UNLM-DCT residuals