Digital image processing, image denoising part of the low-pass de-noising and non-local means are two ways in which non-local means to signal to noise ratio increased by about 10dB.

NLmeans and lpfilter\dftfilt.m
....................\dftuv.m
....................\lpfilter.m
....................\NLMeans1.m
NLmeans and lpfilter

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