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中国精品科技期刊2020
张嫱, 潘磊庆, 陈蒙, 周春涛, 彭菁, 屠康. 基于高光谱图像技术的油桃早期冷害无损检测[J]. 食品工业科技, 2014, (20): 53-56. DOI: 10.13386/j.issn1002-0306.2014.20.002
引用本文: 张嫱, 潘磊庆, 陈蒙, 周春涛, 彭菁, 屠康. 基于高光谱图像技术的油桃早期冷害无损检测[J]. 食品工业科技, 2014, (20): 53-56. DOI: 10.13386/j.issn1002-0306.2014.20.002
ZHANG Qiang, PAN Lei-qing, CHEN Meng, ZHOU Chun-tao, PENG Jing, TU Kang. Detecting chilling injury at early stage of nectarine based on hyperspectral imaging[J]. Science and Technology of Food Industry, 2014, (20): 53-56. DOI: 10.13386/j.issn1002-0306.2014.20.002
Citation: ZHANG Qiang, PAN Lei-qing, CHEN Meng, ZHOU Chun-tao, PENG Jing, TU Kang. Detecting chilling injury at early stage of nectarine based on hyperspectral imaging[J]. Science and Technology of Food Industry, 2014, (20): 53-56. DOI: 10.13386/j.issn1002-0306.2014.20.002

基于高光谱图像技术的油桃早期冷害无损检测

Detecting chilling injury at early stage of nectarine based on hyperspectral imaging

  • 摘要: 研究了应用高光谱图像技术检测"秦光2"号油桃早期冷害的方法。首先通过分析桃果实采后贮存期出汁率变化,确定冷害发生的初始时间。构建反射高光谱采集系统,获取初始发生冷害果及未冷害果在400~1000nm波段的高光谱图像,选择感兴趣区域(ROI)进行分析后,得到冷害发生后桃果实的高光谱特性。进而分别对发生冷害及未冷害桃果实的高光谱反射图像,应用独立主成分分析方法(ICA)降维后优选出特征波长,分别为:冷害果为672nm,未冷害果为656、678、700nm。通过提取以上4个波长下的反射光谱平均值作为Fisher判别方法建模的特征集,对油桃早期冷害判别正确率为98.9%。结果表明,高光谱技术可以检测桃果实早期冷害。 

     

    Abstract: Hyperspectral imaging technique was investigated for the detection of chilling injury in ‘Qinguang 2'nectarine during the early postharvest storage period. At the beginning, extractable juice content was measured during the storage to find the occurrance time point of early chilling injury. Then, hyperspectral imaging system based on reflectance mode was established to acquire chilled and non-chilled nectarine images during the spectral region of 4001000nm, as well as to extract nectarine spectral properties by ROI (region of interest) analysis. Dimension reductions were implemented on hyperspectral reflectance data based on Independent Components Analysis (ICA) , for the chilled nectarines at early stage and non-chilled nectarines respectively.The optimal wavelength selected by ICA were 672 nm for chilled ones and 656, 678 nm and 700 nm for non-chilled ones. Next, spectral average of each characteristic band was chosen as the input of the Fisher discrimination model, an average classification accuracy of 98.9% was achieved to distinguish between normal and early injured nectarines. This research demonstrated that the hyperspectral imaging technique was feasible for the detection of chilled nectarine at the early stage.

     

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