Skip to main content
padlock icon - secure page this page is secure

Shift-invariant wavelet packet for signal de-noising in ultrasonic testing

Buy Article:

$22.00 + tax (Refund Policy)

Wavelet transform has introduced innovative changes in different fields of science and engineering. One of its important applications is in the de-noising of signals and images. The wavelet packet (WP) is an efficient de-noising method, which has been used for ultrasonic testing (UT) signal de-noising; WP is a generalisation of the discrete wavelet transform (DWT). This paper proposes the use of undecimated wavelet transform (UWT) in implementing WP to overcome the limitation of the shift variance encountered in DWT.

Wavelet transforms and their shift-invariance property are briefly explained. Simulations and experiments were carried out on a flow signal contaminated with a material's grain noise. Various wavelet transform processing parameters were investigated, including the number of decomposition levels, analysing wavelets and threshold settings. The results showed a superior de-noising effect of the proposed method over the conventional one.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: DISCRETE WAVELET TRANSFORM; SHIFT-INVARIANT; ULTRASONIC TESTING; UNDECIMATED WAVELET TRANSFORM; WAVELET PACKET

Document Type: Research Article

Publication date: July 1, 2012

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more