Abstract
Hyperspectral imaging, as a non-destructive testing technique with the ability to acquire rich spatial and spectral information, is a potential tool for fruit bruise detection. However, the cost issue is one of the main reasons limiting the popularity of this technique. In addition, it is difficult to detect the entire surface of samples such as fruits due to the uncertainty of the damaged area. Furthermore, directional scattering on the target sample can lead to bright spots and shadows on the acquired hyperspectral image, which can affect the image quality and add additional preprocessing steps. Therefore, a monochromatic illumination model based on the combination of Xenon lamp and reflective grating is proposed. An experimental prototype of the system has realized 101 spectral channels in the 400–700 nm range. The sample is placed in an optical integrating sphere with rollers for indirect illumination to avoid spots and shadows during image acquisition, enabling multi-surface imaging. This prototype is then used to prepare hyperspectral datasets of sound apples and bruised apples. Models built using classic classification algorithms SVM (87.5%), k-NN (82.5%) AlexNet (95%), VGG16 (95%), ResNet (100%), and achieve effective results in tests. The results demonstrate that the HSI system we designed has exceptional performance in apple mechanical damage detection and classification, showing the advantages of good spectral resolution, low cost, and low thermal effect.
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Acknowledgements
The work was supported in part by the National Natural Science Foundation of China with Grant 62065003; in part by Guizhou Provincial Science and Technology Projects with Grant ZK [2022] Key-020; in part by Renjihe of Guizhou University (2012).
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Jian-Feng Chen: methodology, investigation, writing—original draft preparation. Zhao Ding: supervision. Jia-Yong Song: investigation, formal analysis. Yang Wang: software, data curation. Li-Feng Bian: project administration. Chen Yang: conceptualization, writing—review & editing, validation.
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Chen, JF., Ding, Z., Song, JY. et al. Low-cost monochromatic uniform illumination HSI system for detection and classification of apple bruise. Food Measure (2024). https://doi.org/10.1007/s11694-024-02540-8
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DOI: https://doi.org/10.1007/s11694-024-02540-8