Journal of Electrical and Computer Engineering / 2018 / Article / Tab 5

Research Article

Change Point Detection for Piecewise Envelope Current Signal Based on Wavelet Transform

Table 5

Comparison of relative error of the envelope method and the direct method.

Relative error/%db2Sym2Coif1bior2.2

change point 1envelope method0.67710.67715.98965.9896
direct method0.10420.10420.05210.0521
change point 2envelope method0.40620.40623.59373.5937
direct method0.06250.06250.03120.0312
change point 3envelope method2.24612.24610.25390.2539
direct method0.03910.03910.05860.0586