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Evaluating green tea quality based on multisensor data fusion combining hyperspectral imaging and olfactory visualization systems
Author(s) -
Li Luqing,
Xie Shimeng,
Ning Jingming,
Chen Quansheng,
Zhang Zhengzhu
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9371
Subject(s) - hyperspectral imaging , artificial intelligence , pattern recognition (psychology) , linear discriminant analysis , support vector machine , computer science , sensor fusion , data set , principal component analysis , dimensionality reduction , feature (linguistics) , feature extraction , computer vision , philosophy , linguistics
BACKGROUND The instrumental evaluation of tea quality using digital sensors instead of human panel tests has attracted much attention globally. However, individual sensors do not meet the requirements of discriminant accuracy as a result of incomprehensive sensor information. Considering the major factors in the sensory evaluation of tea, the study integrated multisensor information, including spectral, image and olfaction feature information. RESULTS To investigate spectral and image information obtained from hyperspectral spectrometers of different bands, principal components analysis was used for dimension reduction and different types of supervised learning algorithms (linear discriminant analysis, K ‐nearest neighbour and support vector machine) were selected for comparison. Spectral feature information in the near infrared region and image feature information in the visible‐near infrared/near infrared region achieved greater accuracy for classification. The results indicated that a support vector machine outperformed other methods with respect to multisensor data fusion, which improved the accuracy of evaluating green tea quality compared to using individual sensor data. The overall accuracy of the calibration set increased from 75% using optimal single sensor information to 92% using multisensor information, and the overall accuracy of the prediction set increased from 78% to 92%. CONCLUSION Overall, it can be concluded that multisensory data accurately identify six grades of tea. © 2018 Society of Chemical Industry