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Communication Dans Un Congrès Année : 2018

Grading banana by VNIR hyperspectral imaging spectroscopy

Résumé

Bananas are usually harvested in the green-ripe stage and once ripening begins, it is an irreversible process leading banana peel color changes from green to yellow, with brown spots appearing on the yellow color at the end of ripening. The Von Loesecke ripening scale is used by the industry to classify through visual inspection the bananas into one of seven subclasses. Similar scale has been assumed by COPLACA providing to their cooperatives a set of standard images of increasing stages or ripening. This grading process, based on comparison, is very subjective. The sector is demanding an objective procedure for obtaining an indicator able to reflect the real ripening stage. In this paper banana fruit ripening stages were studied along the storage period in ripening chamber (12°C and 80-90% RH) by using hyperspectral imaging technique in the visible and near infrared (400-1000 nm) regions. Two batches of 7 and 14 bananas were monitored. Spectral patterns corresponding to the different ripening stages were distinguished. The main changes in the relative reflectance spectra are located at 680 nm, where an absorption band of the chlorophyll is centered. The scores of the first principal component (94.6% of the explained variance) of the principal component analysis applied on a calibration set of spectra, showed significant differences between the seven maturity classes. Virtual images of banana based on this PCA were generated and spatially characterized in order to classify each individual fruit into one of the COPLACA classes.
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Dates et versions

hal-02608024 , version 1 (16-05-2020)

Identifiants

Citer

B. Diezma, S. Franco, L. Lleó, T. Presečki, J.M. Roger. Grading banana by VNIR hyperspectral imaging spectroscopy. VIII International Postharvest Symposium: Enhancing supply chain and consumer benefits - Ethical and technological issues, Jun 2016, Cartagena, Spain. pp.1283-1289, ⟨10.17660/ActaHortic.2018.1194.181⟩. ⟨hal-02608024⟩
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