Table 1.

The process of fast NL-Means.

Given a Time Series of Vibration Signals y = [a1,a2,a3,…aN]. N Denotes the Length of the Time Series.
(1) To determine the parameters, half of the search domain size K, half of patch size p, bandwidth parameter λ.
(2) Do summation over 2K + 1; calculate all of the values of Sdx using Equation (4). Then, increase dx gradually by each step.
(3) Calculate all of the values of distance (point-by-point MSE) d2 using Equations (5) and (6). Calculate all of the values of weights ω using Equation (3).
(4) Finally, apply Equation (2) to realize the process of the filter.