Image sharpening of concrete voids with the application of parasitic discrete wavelet transform
Creators
- 1. University of Fukui, Graduate School of Engineering, Fukui (Japan)
- 2. University of Fukui, Fukui (Japan)
Description
This study attempts image sharpening of concrete voids with the application of parasitic discrete wavelet transform. For detection of flaws existing inside the concrete, Linearized Inverse Scattering Methods (LISM) based on Born and Kirchhoff approximation can be applicable to reconstruct the shape of flaws with ultrasonic waves. The frequency characteristic components in the scattering wave from flaws are extracted by parasitic discrete wavelet transform with real-signal mother wavelet (RMW). RMW is created from the scattering wave from the targeted flaw. Scattered waves are filtered by parasitic discrete specialized for the targeted flaw, then they are processed with Kirchhoff based LISM. The reconstructed images show the improvement of flaw sharpening. (author)
Availability note (English)
Available from https://doi.org/10.2208/jscejam.73.I_691Abstract (Japanese)
超音波計測により得られた波形よりコンクリート内在欠陥を把握するための有効手段として,線形化逆散乱解析に基づく欠陥形状再構成手法が挙げられる.本研究では欠陥形状情報を含む独自のマザーウェーブレットを用いた寄生的離散ウェーブレット変換を適用し,欠陥からの散乱波の特徴を有する周波数帯を抽出することで,健全部と欠陥部の差別化を図る.空洞欠陥を模したコンクリート試験体に関して,超音波探傷実験で得られた散乱波に対して,欠陥からの散乱波をもとにした実信号マザーウェーブレットに対応する低周波側寄生フィルタを寄生的離散ウェーブレット変換に用いて特徴周波数帯を抽出し,キルヒホフ逆散乱解析を適用することで空洞部分の鮮明な画像化を可能とした.(著者)Additional details
Additional titles
- Original title (Japanese)
- 寄生的離散ウェーブレット変換を応用したコンクリート内在欠陥像の形状鮮明化
Identifiers
Publishing Information
- Journal Title
- Doboku Gakkai Ronbunshu A2. Oyo Rikigaku (Online)
- Journal Volume
- 73
- Journal Issue
- 2
- Series
- 雑誌名:土木学会論文集A2(応用力学)
- Journal Page Range
- p. 1.691-1.698
- ISSN
- 2185-4661
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 51030121
- Subject category
- S42: ENGINEERING;
- Descriptors DEI
- BORN APPROXIMATION; BRIDGES; CONCRETES; DEFECTS; FOURIER TRANSFORMATION; FREQUENCY RANGE; OSCILLOGRAPHS; SERVICE LIFE; ULTRASONIC TESTING; ULTRASONIC WAVES; WAVE FORMS
- Descriptors DEC
- ACOUSTIC TESTING; APPROXIMATIONS; BUILDING MATERIALS; CALCULATION METHODS; ELECTRONIC EQUIPMENT; EQUIPMENT; INTEGRAL TRANSFORMATIONS; LIFETIME; MATERIALS; MATERIALS TESTING; MECHANICAL STRUCTURES; NONDESTRUCTIVE TESTING; SOUND WAVES; TESTING; TRANSFORMATIONS
Optional Information
- Notes
- 17 refs., 20 figs., 1 tab.