公开(公告)号：US20210333237A1

公开(公告)日：2021-10-28

申请号：US17202787

申请日：2021-03-16

Applicant: HARBIN ENGINEERING UNIVERSITY

Inventor： Lanyong ZHANG ,  Menglin WANG ,  Sheng LIU ,  Chengyu LI

IPC: G01N27/82

Abstract: The present disclosure provides a distortion-free boundary extension method for online wavelet denoising. The method includes: S1: acquiring a signal segment xn, and performing a distortion-free boundary extension on the signal segment to obtain M+N+L data; S2: decomposing a lifting wavelet of the N data to be denoised into j layers to acquire approximation coefficients and detail coefficients; S3: calculating a threshold of each layer of the lifting wavelet; S4: thresholding the detail coefficients of each layer to obtain estimated values of the detail coefficients; S5: performing wavelet reconstruction by the approximation coefficients and the estimated values of the detail coefficients obtained by thresholding to obtain a reconstructed signal after denoising; and S6: outputting data.