Rolling Bearing Fault Vibration Signal Denoising Based on Adaptive Morphological Wavelet Perona–Malik Filter Algorithm

Table 1

SNR of several denoising algorithms.

Gaussian white noise standard deviation	Perona–Malik model	Catté model	The improved model (own gradient)	The improved model (average gradient)
0.2	1.64	1.65	1.71	3.05
0.5	0.86	1.09	1.18	2.39
1	−1.14	−0.43	−0.23	0.71
2.5	−6.60	−5.98	−4.85	−4.25