Abstract
This study was conducted to investigate the potential of hyperspectral imaging technique in a rapid and non-invasive manner for measuring colour distribution of grass carp fillets during cold storage. The quantitative calibration models were established between the spectral data extracted from the hyperspectral images and the measured colour reference values by partial least squares regression (PLSR) and least squares support vector machines (LS-SVM). The performance of two spectral ranges of 400–1,000 and 1,000–2,500 nm was compared to select the best spectral range for further colour analysis of grass carp fillets. The LS-SVM model using the whole spectral range possessed better performance than the PLSR model for predicting colour components of L* and a* with higher coefficients of determination (R 2 P) of 0.916 and 0.905 and lower root-mean-square errors of prediction (RMSEPs) of 2.876 and 2.253, respectively. Seven (466, 525, 590, 620, 715, 850 and 955 nm) and five (465, 585, 660, 720 and 950 nm) optimal wavelengths carrying the most important and sensitive information were recognized and selected using successive projections algorithm (SPA) for predicting L* and a*, with R 2 P values of 0.912 and 0.891 being obtained from the optimized SPA-LS-SVM models established based on the selected valuable wavelengths. In addition, the visualization maps of colour distribution of the examined fish fillets were acquired. The overall results of this study demonstrated that hyperspectral imaging technique in the spectral range of 400–1,000 nm has the potential to be used as an objective and promising tool for rapid and non-destructive measurement of colour distribution of grass carp fillets.
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Acknowledgments
The authors were grateful to the Guangdong Province Government (China) for its support through the program of ‘Leading Talent of Guangdong Province (Da-Wen Sun)’. This research was also supported by the National Key Technologies R&D Program (2014BAD08B09) and the Foundation for the Author of National Excellent Doctoral Dissertation of South China University of Technology.
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Cheng, JH., Sun, DW., Pu, H. et al. Comparison of Visible and Long-wave Near-Infrared Hyperspectral Imaging for Colour Measurement of Grass Carp (Ctenopharyngodon idella). Food Bioprocess Technol 7, 3109–3120 (2014). https://doi.org/10.1007/s11947-014-1325-7
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DOI: https://doi.org/10.1007/s11947-014-1325-7