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Smoothes an input image using the noise cheating enhancement method. The method only makes sense to search for positive signals.
Values for adjacent pixels are summed until a given total (specified by Threshold) is reached. Then, the total is divided by the number of pixels added and the result is used for the output pixel value.
This smoothing is very non linear and spatially variable: in particular no smoothing occur on pixels stronger than the smoothing threshold. Parameter RADIUS (in pixels) allows to restrict the averaging to nearby pixels only, rather than the whole image.