计算机工程与应用 ›› 2012, Vol. 48 ›› Issue (31): 108-111.

• 数据库、信号与信息处理 • 上一篇    下一篇

一个第二代小波的信号奇异性检测

徐丙莲1,樊宝强1,张秋胜2   

  1. 1.鲁东大学 数学与信息科学学院,山东 烟台 264025
    2.鲁东大学 生命科学学院,山东 烟台 264025
  • 出版日期:2012-11-01 发布日期:2012-10-30

Singularity detection of second-generation wavelet

XU Binglian1, FAN Baoqiang1, ZHANG Qiusheng2   

  1. 1.College of Maths and Information, Ludong University, Yantai, Shandong 264025, China
    2.College of Life Science, Ludong University, Shandong, Yantai, Shandong 264025, China
  • Online:2012-11-01 Published:2012-10-30

摘要: 利用提升格式原理构造了一个对称的具有二阶消失矩的第二代小波DEC,并将其应用于信号的奇异性检测。与经典小波DB2的检测效果相比较,两者都可以准确地检测出信号的奇异点,但在Lip指数的计算方面,DEC比DB2以及其他大部分经典小波的准确性要强得多,仅次于墨西哥草帽小波。但是墨西哥草帽小波是一个非紧支集且只有零阶消失矩的小波。实验结果表明,第二代小波DEC比大部分经典小波更适合于信号的奇异性检测。

关键词: 提升格式, 第二代小波, 奇异性, 经典小波, Lip指数

Abstract: A symmetrical second-generation wavelet dec with two vanishing moments is constructed accroding to the lifting scheme, and is applied to the singularity detection of signal. Compared with the detection effect of the DB2 wavelet, DEC and DB2 can detect the singularity point of signal correctly. But as far as the computation of Lip exponent is concerned, the computational accuracy of DEC is suprier to that of DB2 and most of classical wavelets and only inferior to that of the Mexh wavelet. But the Mexh wavelet hasn’t compact support and only has zero vanishing moment. The experimental data show that the second-generation wavelet DEC is more fit for the singularity detection of signal than most of classical wavelets.

Key words: lifting scheme, second-generation wavelet, singularity, classical wavelet, Lip exponent