Abstract
In this study, wavelet textural analysis was applied to hyperspectral images in the visible and near-infrared (VIS/NIR) region (400–1,000 nm) for differentiation between fresh and frozen–thawed pork. The spectral data of acquired hyperspectral images were analyzed using partial least squares (PLS) regression and five wavelengths (462, 488, 611, 629, and 678 nm) were selected as the feature wavelengths by the regression coefficients from the PLS model. The fourth-order daubechies wavelet (“db4”) was used to serve as the wavelet mother function for wavelet textural extraction of the feature images at the above selected feature wavelengths with the wavelet decomposition level from 1 to 4. Four textural features were calculated in the horizontal, vertical, and diagonal orientations at each level. Forty-eight textural features were extracted from each feature image and used to differentiate between fresh and frozen–thawed pork samples by least-squares support vector machine (LS-SVM) model. Wavelet texture extracted from all five feature images at first decomposition level was identified as optimal wavelet texture combination, resulting in the highest classification accuracy for the LS-SVM models (98.48 % for the training set and 93.18 % for the testing set). Based on the texture combination, the quality attributes of pork meat could be predicted with correlation coefficients of calibration (r c ) of 0.982 and 0.913, and correlation coefficients of prediction (r p ) of 0.845 and 0.711 for pH and thawing loss, respectively. The results showed the possibility of developing a fast and reliable hyperspectral system for discrimination between fresh and frozen–thawed pork samples based on wavelet texture in the VIS/NIR wavelength range.
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Acknowledgments
The authors are grateful to the Guangdong Province Government (China) for 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), the Fundamental Research Funds for the Central Universities (2014ZM0027), and China Postdoctoral Science Foundation (2013M530366).
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Pu, H., Sun, DW., Ma, J. et al. Using Wavelet Textural Features of Visible and Near Infrared Hyperspectral Image to Differentiate Between Fresh and Frozen–Thawed Pork. Food Bioprocess Technol 7, 3088–3099 (2014). https://doi.org/10.1007/s11947-014-1330-x
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DOI: https://doi.org/10.1007/s11947-014-1330-x