[1]徐钧,周西峰,郭前岗. 超声信号的小波增强与改进去噪研究[J].计算机技术与发展,2015,25(02):82-85.
　XU Jun,ZHOU Xi-feng,GUO Qian-gang. Research on Improved De-noising and Wavelet Enhancement of Ultrasonic Signal[J].,2015,25(02):82-85.
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 超声信号的小波增强与改进去噪研究()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
25
期数:
2015年02期
页码:
82-85
栏目:
智能、算法、系统工程
出版日期:
2015-02-10

文章信息/Info

Title:
 Research on Improved De-noising and Wavelet Enhancement of Ultrasonic Signal
文章编号:
1673-629X（2015)02-0082-04
作者:
 徐钧; 周西峰; 郭前岗
 南京邮电大学 自动化学院
Author(s):
 XU Jun; ZHOU Xi-feng ; GUO Qian-gang
关键词:
 ; 预处理; 改进阈值函数; 自适应阈值; 小波去噪; 信号噪声比
Keywords:
 ; preprocessing; improved threshold function; adaptive threshold; wavelet denoising; signal-to-noise ratio
分类号:
TN911.4
文献标志码:
A
摘要:
 预处理技术广泛应用于图像处理领域，文中将预处理技术应用到超声回波信号处理中。传统的阈值函数存在着明显的缺点：硬阈值函数在函数域内存在不连续的问题，软阈值函数去噪后存在恒定偏差。文中提出的改进阈值函数能够弥补硬阈值函数和软阈值函数方法的不足；提出的自适应阈值减小了由小波系数阈值不准确引起的误差。仿真结果表明，经过预处理的信号相比原始信号，信号特征有明显提高；使用改进阈值函数和自适应阈值较传统方法能明显提高去噪的效果，体现在信噪比的提高以及均方误差的减少等方面。
Abstract:
 he pretreatment technology is widely used in image processing field,in this paper,apply the pretreatment technology to the ul-trasonic signal processing. Traditional threshold treatment has obvious disadvantages. Hard threshold function is discontinuous in its func-tional domain and soft threshold function has the dispersion between the estimated wavelet coefficients. In this paper,the improved thresh-old function can make up the shortage of hard threshold function and soft threshold function. And the adaptive threshold reduces the error caused by threshold values between different wavelet coefficients. Simulation results show that compared with the original signal,the sig-nal after the preprocessing has more obvious signal characteristics,and compared with the traditional threshold function,using the pro-posed threshold function can obviously improve the de-noising effect,which has reflected in the improvement of signal-to-noise ratio and the decrease of mean square error and so on.

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更新日期/Last Update: 2015-04-28