期刊
JOURNAL OF NEAR INFRARED SPECTROSCOPY
卷 12, 期 4, 页码 263-269出版社
N I R PUBLICATIONS
DOI: 10.1255/jnirs.434
关键词
NIR spectroscopy; support vector machines; PLS regression; SilviScan; Pinus taeda; air-dry density; microfibril angle; stiffness
Near infrared (NIR) spectroscopy offers a rapid method for estimating many important wood properties, including air-dry density, microfibril angle (MFA) and SilviScan estimated stiffness (E-L(SS)). Wood property calibrations may be improved by using non-linear calibration methods. In this study, we compare calibrations developed using partial least squares (PLS) regression and least-squares support vector machine (LS-SVM) regression, a relatively new technique for modelling multivariate, non-linear systems. LS-SVM regression provided the strongest calibration statistics for all wood properties. For an equivalent number of latent variables, the predictive performance of the MFA LS-SVM calibrations were superior to those of the corresponding PLS calibration, while predictive results for air-dry density and E-L(SS) were similar for both calibration methods.
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