| dc.creator |
Pardo, Emilia |
|
| dc.creator |
San Emeterio, José Luis |
|
| dc.creator |
Rodríguez, Miguel A. |
|
| dc.creator |
Ramos, Antonio |
|
| dc.date |
2008-06-25T11:48:07Z |
|
| dc.date |
2008-06-25T11:48:07Z |
|
| dc.date |
2007-12 |
|
| dc.date.accessioned |
2017-01-31T01:49:54Z |
|
| dc.date.available |
2017-01-31T01:49:54Z |
|
| dc.identifier |
XIX Congreso Internacional de Acústica (ICA2007) |
|
| dc.identifier |
http://hdl.handle.net/10261/5325 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5325 |
|
| dc.description |
Ponencia presentada en el XIX Congreso Internacional de Acústica (ICA2007), Madrid, 2-7 Sep 2007.-- PACS: 43.60.Hj. |
|
| dc.description |
Wavelet processing has become a popular and well-established technique that offers good
results and great flexibility for noise reduction. The basic wavelet de-noising scheme consists of a thresholding of the Discrete Wavelet Transform (DWT) coefficients. Nevertheless, some
improvements over this basic non-linear scheme can be obtained by the use of Undecimated Wavelet Transforms (UWT), also known as redundant, shift-invariant or stationary wavelet transforms, because they provide redundant and translation invariant representations. The introduction of redundancy produces less efficient signal representations but it can be useful in
de-noising. Ultrasonic traces are frequently contaminated with structural or grain noise, which can not be removed by classical time averaging or band-pass filtering. An analysis of wavelet de-noising of some individual traces is presented. In addition, a significant number of synthetic ultrasonic signals are also processed for a statistical study and comparison of UWT and DWT de-noising in terms of the signal-to-noise ratio of the resulting traces. |
|
| dc.description |
This work has been supported by the Spanish MEC, R&D Project CICYT Ref. DPI2005-00124 of the I+D National Plan and grant FPI BES-2004-5296. |
|
| dc.description |
Peer reviewed |
|
| dc.format |
95147 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
Sociedad Española de Acústica |
|
| dc.relation |
ICA2007 |
|
| dc.relation |
ULT-10-005-IP |
|
| dc.rights |
openAccess |
|
| dc.subject |
Ultrasonic imaging and detection |
|
| dc.subject |
Signal processing |
|
| dc.subject |
Noise reduction |
|
| dc.subject |
Wavelet processing |
|
| dc.subject |
Discrete Wavelet Transform (DWT) |
|
| dc.subject |
Undecimated Wavelet Transform (UWT) |
|
| dc.subject |
Grain noise |
|
| dc.subject |
Ultrasonic traces |
|
| dc.title |
Shift invariant wavelet processing of ultrasonic traces |
|
| dc.type |
Comunicación de congreso |
|