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Identification of fungi-contaminated peanuts using hyperspectral imaging technology and joint sparse representation model

  • Xiaotong Qi
  • Jinbao JiangEmail author
  • Ximin Cui
  • Deshuai Yuan
Original Article

Abstract

Peanuts with fungal contamination may contain aflatoxin, a highly carcinogenic substance. We propose the use of hyperspectral imaging to quickly and noninvasively identify fungi-contaminated peanuts. The spectral data and spatial information of hyperspectral images were exploited to improve identification accuracy. In addition, successive projection was adopted to select the bands sensitive to fungal contamination. Furthermore, the joint sparse representation based classification (JSRC), which considers neighboring pixels as belonging to the same class, was adopted, and the support vector machine (SVM) classifier was used for comparison. Experimental results show that JSRC outperforms SVM regarding robustness against random noise and considering pixels at the edge of the peanut kernel. The classification accuracy of JSRC reached 99.2% and 98.8% at pixel scale, at least 98.4% and 96.8% at kernel scale for two peanut varieties, retrieving more accurate and consistent results than SVM. Moreover, fungi-contaminated peanuts were correctly marked in both learning and test images.

Keywords

Fungal contamination Peanut Hyperspectral image Joint sparse representation Classification 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (41571412, 41871341).

Author contributions

Xiaotong Qi carried out the experiment and analyzed the data, and wrote the manuscript. Jinbao Jiang and Ximin Cui designed the experiment and guided the data analysis. Deshuai Yuan involved the process of the experiment and data collection. All authors reviewed and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest to declare.

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Copyright information

© Association of Food Scientists & Technologists (India) 2019

Authors and Affiliations

  • Xiaotong Qi
    • 1
  • Jinbao Jiang
    • 1
    Email author
  • Ximin Cui
    • 1
  • Deshuai Yuan
    • 1
  1. 1.College of Geosciences and Surveying EngineeringChina University of Mining and TechnologyBeijingChina

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