To remove the impact of noise on the ultrasonic testing signals of standing trees, wavelet transform method was used to eliminate the noise in the collected ultrasonic signals in the field. In order to achieve the best denoising effect, four kinds of wavelet base denoising parameters including Daubechies (db), Symlets (sym), Coiflets (coif), and Discrete Meyer (dmey) were compared, and the best denoising effect was obtained with db3 wavelet base. The variations of denoising parameters corresponding to the number of db3 wavelet decomposition levels (1- 8) were further analyzed and the decomposition level 4 was demonstrated the best. Meanwhile, the effects of wavelet denoising under different threshold states were compared and the hard rigrsure threshold was demonstrated the best. Experimental results showed that the wavelet transform can effectively remove noise hidden in the ultrasonic signal and improve the denoising effect by selecting reasonable parameters, which laid some initial groundwork for efficient extraction of useful information from the ultrasonic signals.
목차
Abstract 1. Introduction 2. Material and Method 2.1. Ultrasonic Signal Acquisition and Data Preprocessing 2.2. The Principles of Wavelet Denoising 2.3. Evaluation of Denoising 3. Results and Analysis 3.1. Effects of Denoising by Different Wavelet Bases 3.2. Effects of Denoising by Different Decomposition Levels 3.3. Effects of Denoising by Different Thresholds 3.4. Effect of Wavelet Transform Denoising 4. Conclusions and Discussion References
키워드
UltrasonicStanding treeWavelet transformDenoising
저자
Wenshu Lin [ College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China ]
Haokai Xu [ College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China ]
Jinzhuo Wu [ College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China ]
Corresponding author
보안공학연구지원센터(IJSIP) [Science & Engineering Research Support Center, Republic of Korea(IJSIP)]
설립연도
2006
분야
공학>컴퓨터학
소개
1. 보안공학에 대한 각종 조사 및 연구
2. 보안공학에 대한 응용기술 연구 및 발표
3. 보안공학에 관한 각종 학술 발표회 및 전시회 개최
4. 보안공학 기술의 상호 협조 및 정보교환
5. 보안공학에 관한 표준화 사업 및 규격의 제정
6. 보안공학에 관한 산학연 협동의 증진
7. 국제적 학술 교류 및 기술 협력
8. 보안공학에 관한 논문지 발간
9. 기타 본 회 목적 달성에 필요한 사업
간행물
간행물명
International Journal of Signal Processing, Image Processing and Pattern Recognition
간기
격월간
pISSN
2005-4254
수록기간
2008~2016
십진분류
KDC 505DDC 605
이 권호 내 다른 논문 / International Journal of Signal Processing, Image Processing and Pattern Recognition Vol.9 No.1