Ultrasonic Signal Denoising in Wavelet Domain Based on Improved Threshold Function
摘 要
针对超声无损检测中超声信号受噪声污染、信噪比不高的情况,提出了一种新的基于改进阈值函数的小波域超声信号去噪方法。通过仿真实验,证明了该方法能够取得很好的去噪效果。相对于经典的阈值函数,改进的阈值函数在超声信号去噪中更具有优势。
Abstract
Aimed at the ultrasonic signal polluted by noises, which is low in SNR, a method of the ultrasonic signal denoising in wavelet domain based on an improved threshold function was put forward. By the simulated test, this method was showed a remarkable effect in signal denoising. Compared with the traditional threshold functions, the improved one was more advantageous in ultrasonic signal denoising.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
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收稿日期 2006/7/14
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备注汪同庆(1949-),男,教授,博导,研究方向为仪器科学及图像处理技术,曾获国家及省部级科技进步奖4项,美国第七届发明与新产品国际博览会大奖及计算机类金奖,获国家专利近10项,发表论文50多篇。
引用该论文: WANG Tong-qing,GUO Zi-yi,LIU Jia-bing,YE Jun-yong. Ultrasonic Signal Denoising in Wavelet Domain Based on Improved Threshold Function[J]. Nondestructive Testing, 2007, 29(11): 641~643
汪同庆,郭子义,刘家兵,叶俊勇. 一种基于改进阈值函数的小波域超声信号去噪方法[J]. 无损检测, 2007, 29(11): 641~643
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参考文献
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【2】马宏伟,王 彬.小波变换在超声检测信号去噪中的应用[J].无损检测,2001,26(2):68-71.
【3】李书,陈益.超声探测弱信号提取方法[J].振动、测试与诊断, 2006 ,26 (1):33-36.
【4】Li Su ,Guoliang Zhao. Denoising of ECG signal using translation invariant wavelet denoising method with improved thresholding [C]. Shanghai: Engineering in Medicine and Biology 27th Annual Conference ,2005: 5946-5949.
【5】David L Donoho. Denoising by soft thresholding [J].IEEE Transactions on Information Theory ,1995,41 (3) :613-627.
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