Understanding changes of laser backscattering imaging parameters through the kiwifruit softening process using time series analysis
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Date
2024-05-12
Open Access Location
Authors
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Journal ISSN
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Publisher
Taylor and Francis Group on behalf of the Royal Society of New Zealand
Rights
CC BY-NC-ND 4.0
Abstract
During kiwifruit storage, quality monitoring is required for inventory planning and consistent quality maintenance. Commercial near-infrared (NIR) spectrophotometers showed reduced performance in the estimation of kiwifruit flesh firmness (FF) as the FF estimation is indirect and can be affected when both, textural structures and absorbing compounds, change during postharvest ripening. Laser backscattering imaging (LBI) records the backscattered signal after a single laser beam interacts with kiwifruit tissue, including merged information on light absorption and scattering. Measurements were carried out at 830 nm, where scattering is most dominant. In this work, time series of kiwifruit ‘Zesy002’ (n = 30) and ‘Hayward’ (n = 30) LBI were collected through the postharvest ripening during a 15-day shelf life at 20°C. Four LBI parameters capturing DIP, FWHM, SLP and HWQM were selected in this study. ‘‘Zesy002’ DIP, FWHM, SLP, and HWQM increased approx. 0.6 cm, 0.2 cm, 0.3 and 0.14 cm, respectively. ‘Hayward’ LBI increased approx. 0.2 cm, 0.1 cm, 0.2 and 0.04 cm, respectively. Different initial LBI values between cultivars and LBI changes may reflect the actual stage of softening, affected by kiwifruit ripeness. In conclusion, time series analysis could be useful in describing kiwifruit LBI change during ripening and making forecasts.
Description
Keywords
Actinidia, Holt-winters, ARIMA, firmness, forecast
Citation
Yang Z, Li M, East A, Zude-Sasse M. (2024). Understanding changes of laser backscattering imaging parameters through the kiwifruit softening process using time series analysis. New Zealand Journal of Crop and Horticultural Science. 52. 3. (pp. 240-264).