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The optimal σr values as a function of the noise standard deviation σn are plotted based on the experiments with 200 test images. The blue data points are the mean of optimal σr values that produce the smallest MSE for each σn value. The blue vertical lines denote the standard deviation of the optimal σr for the test images. The least squares fits to the means of the optimal σr/σn data are plotted as red lines. The slopes of these lines are, from left to right, 2.56, 2.16, and 1.97.
