非局部均值是一种基于快匹配来确定滤波权值的。即先确定一个块的大小，例如7x7，然后在确定一个搜索区域，例如15x15，在15x15这个搜索区域中的每一个点，计算7x7的窗口与当前滤波点7x7窗口的绝对差值和，然后在计算一个指数函数，所有的搜索点都用指数函数计算出一个权值，当然还有权值的归一化。根据这个权值进行点的滤波操作。-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.