Ultrasonic speckle reduction based on soft thresholding in quaternion wavelet domain

2012 ◽  
Author(s):  
Jing Jin ◽  
Yipeng Liu ◽  
Qiang Wang ◽  
Shen Yi
Keyword(s):  
Speckle Reduction ◽  
Wavelet Domain ◽  
Soft Thresholding ◽  
Ultrasonic Speckle

Phase-preserving speckle reduction based on soft thresholding in quaternion wavelet domain

2012 ◽  
Vol 21 (4) ◽  
pp. 043009 ◽  
Author(s):  
Yipeng Liu ◽  
Jing Jin ◽  
Qiang Wang ◽  
Yi Shen
Keyword(s):  
Speckle Reduction ◽  
Wavelet Domain ◽  
Soft Thresholding

Threshold-Varying Method of Stationary Wavelet Denoising for Ultrasonic Speckle Reduction

2004 ◽  
Vol 449-452 ◽  
pp. 1153-1156
Author(s):  
Chi Seong Park ◽  
Young Seock Lee ◽  
Seon Jin Kim
Keyword(s):  
Nuclear Power ◽  
Ultrasonic Inspection ◽  
Threshold Level ◽  
Wavelet Denoising ◽  
Speckle Reduction ◽  
Wavelet Domain ◽  
Ultrasonic Signals ◽  
Ultrasonic Speckle ◽  
Inspection Techniques ◽  
Cast Stainless Steel

Ultrasonic inspection of the cast stainless steel with coarse grain size has not been possible to demonstrate unambiguously that current inspection techniques are adequate, which means it is very difficult for ultrasonic inspector to discriminate the reflected signals at the real flaw from scattered signals. In this paper, wavelet denoising is performed in the stationary wavelet domain by means of scale-varying threshold level to reduce the speckle and to enhance flaw-visibility. Experiments have been carried out on A-scan ultrasonic signals obtained from CCSS material which is a part of narrow gap welds connecting the steam generator to main reactor coolant piping in the nuclear power plant.

scholarly journals Nonlinear Diffusion in Laplacian Pyramid Domain for Ultrasonic Speckle Reduction

2007 ◽  
Vol 26 (2) ◽  
pp. 200-211 ◽  
Author(s):  
Fan Zhang ◽  
Yang Mo Yoo ◽  
Liang Mong Koh ◽  
Yongmin Kim
Keyword(s):  
Nonlinear Diffusion ◽  
Speckle Reduction ◽  
Laplacian Pyramid ◽  
Ultrasonic Speckle
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