It is a non-local means to determine the filter weight based on fast matching. That is, first determine the size of a block, for example 7x7, and then define a search area, such as 15x15, 15x15 in the search area for each point, compute the 7x7 filter window and the current window 7x7 point absolute difference and then calculate an exponential function, all search points are calculated using an exponential function of the weights, of course, also have the right values normalized. Filtering based on the operating point of the weights.

NLmeansfilter.m

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