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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 225-226Size Estimation of Tomato Fruits Based on...

Size Estimation of Tomato Fruits Based on Spectroscopic Analysis

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Abstract:

This study used visible and near-infrared (VIS-NIR) spectroscopy for size estimation of tomato fruits of three cultivars. A mobile, fibre-type, VIS-NIR spectrophotometer (AgroSpec, Tec 5, Germany) with spectral range of 350-2200 nm, was used to measure reflectance spectra of on-vine tomatoes growing from July to September 2010. Spectra were divided into a calibration set (75%) and an independent validation set (25%). A partial least squares regression (PLSR) with leave-one-out cross validation was adopted to establish calibration models between fruit diameter and spectra. Furthermore, the latent variables (LVs) obtained from PLS regression was used as input to back-propagation artificial neural network (BPANN) analysis. Result shows that the prediction of PLSR model can produce good performance with coefficient of determination (R²) of 0.82, root-mean-square error of prediction (RMSEP) of 4.87 mm and residual prediction deviation (RPD) of 2.35. Compared to the PLSR model, the PLS-BPANN model provides considerably higher prediction performance with R² of 0.88, RMSEP of 3.98 mm and RPD of 2.89. It is concluded that VIS-NIR spectroscopy coupled with PLS-BPANN can be adopted successfully for size estimation of tomato fruits.

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Periodical:

Advanced Materials Research (Volumes 225-226)

Pages:

1254-1257

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.225-226.1254

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Online since:

April 2011

Authors:

Hai Qing Yang, Bo Yan Kuang, Abdul M. Mouazen

Keywords:

Near Infrared Spectroscopy (NIRS), Partial Least Square Regression (PLSR), Size, Tomato, Visible Infrared Spectroscopy

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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