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Sensors 2018, 18(12), 4306; https://doi.org/10.3390/s18124306

Lifting Wavelet Transform De-noising for Model Optimization of Vis-NIR Spectroscopy to Predict Wood Tracheid Length in Trees

1
College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China
2
Forest Products Development Center, SFWS, Auburn University, Auburn, AL 36849, USA
*
Author to whom correspondence should be addressed.
Received: 25 October 2018 / Revised: 26 November 2018 / Accepted: 4 December 2018 / Published: 6 December 2018
(This article belongs to the Section Remote Sensors)
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Abstract

The data analysis of visible-near infrared (Vis-NIR) spectroscopy is critical for precise information extraction and prediction of fiber morphology. The objectives of this study were to discuss the de-noising of Vis-NIR spectra, taken from wood, to improve the prediction accuracy of tracheid length in Dahurian larch wood. Methods based on lifting wavelet transform (LWT) and local correlation maximization (LCM) algorithms were developed for optimal de-noising parameters and partial least squares (PLS) was employed as the prediction method. The results showed that: (1) The values of tracheid length in the study were generally high and had a great positive linear correlation with annual rings (R = 0.881), (2) the optimal de-noising parameters for larch wood based Vis-NIR spectra were Daubechies-2 (db2) mother wavelet with 4 decomposition levels while using a global fixed hard threshold based on LWT, and (3) the Vis-NIR model based on the optimal LWT de-noising parameters ( R c 2 = 0.834, RMSEC = 0.262, RPD c = 2.454) outperformed those based on the LWT coupled with LCM algorithm (LWT-LCM) ( R c 2 = 0.816, RMSEC = 0.276, RPD c = 2.331) and raw spectra ( R c 2 = 0.822, RMSEC = 0.271, RPD c = 2.370). Thus, the selection of appropriate LWT de-noising parameters could aid in extracting a useful signal for better prediction accuracy of tracheid length. View Full-Text
Keywords: lifting wavelet transform; Vis-NIR spectroscopy; larch; tracheid length lifting wavelet transform; Vis-NIR spectroscopy; larch; tracheid length
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, Y.; Via, B.K.; Cheng, Q.; Li, Y. Lifting Wavelet Transform De-noising for Model Optimization of Vis-NIR Spectroscopy to Predict Wood Tracheid Length in Trees. Sensors 2018, 18, 4306.

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