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Feature extraction of wood-hole defects using wavelet-based ultrasonic testing

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Abstract

The primary bottleneck to extracting wood defects during ultrasonic testing is the accuracy of identifying the wood defects. The wavelet energy moment was used to extract defect features of artificial wood holes drilled into 120 elm samples that differed in the number of holes to verify the validity of the method. Wavelet energy moment can reflect the distribution of energy along the time axis and the amount of energy in each frequency band, which can effectively extract the energy distribution characteristics of signals in each frequency band; therefore, wavelet energy moment can replace the wavelet frequency band energy and constitute wood defect feature vectors. A principal component analysis was used to normalize and reduce the dimension of the feature vectors. A total of 16 principal component features were then obtained, which can effectively extract the defect features of the different number of holes in the elm samples.

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Authors and Affiliations

  1. Northeast Forestry University, Harbin, 150040, People’s Republic of China

    Huiming Yang & Lei Yu

Authors
  1. Huiming Yang
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  2. Lei Yu
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Corresponding author

Correspondence to Lei Yu.

Additional information

Project funding: This study was financially supported by the Fundamental Research Funds for the Central Universities (2572016CB11 and 2572014CB35), Natural Science Foundation of Heilongjiang Province (F2015036 and QC2014C010) and 948 Project (2014-4-78).

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Corresponding editor: Hu Yanbo

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Yang, H., Yu, L. Feature extraction of wood-hole defects using wavelet-based ultrasonic testing. J. For. Res. 28, 395–402 (2017). https://doi.org/10.1007/s11676-016-0297-z

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  • DOI: https://doi.org/10.1007/s11676-016-0297-z

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