Example of the behavior of the smoothing amplification factor μi,j. (a) Noisy image. (b) Smoothing rates computed for (a) presented as an image. Large values of μi,j (red points) are everywhere. (c) Partially denoised image after some iterations of the SFP1 method. (d) Computed values of μi,j for (c). Clearly the larger values of μi,j, around 0.625 for this example, group along edges.