https://www.cs.tut.fi/~foi/GCF-BM3D/BM3D_TIP_2007.pdf And according to test images presented in another page (https://dmitryulyanov.github.io/deep_image_prior), "BM3D" might be even better than Non-Local Means. Although it's unclear which patch size for NLM was used in that comparison… if it was small then it doesn't say anything yet.
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