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中国精品科技期刊2020
尚静,刘志洋,谭涛,等. 基于高光谱成像的猕猴桃主要品质指标的快速无损检测J. 食品工业科技,2026,47(6):1−10. doi: 10.13386/j.issn1002-0306.2025020053.
引用本文: 尚静,刘志洋,谭涛,等. 基于高光谱成像的猕猴桃主要品质指标的快速无损检测J. 食品工业科技,2026,47(6):1−10. doi: 10.13386/j.issn1002-0306.2025020053.
SHANG Jing, LIU Zhiyang, TAN Tao, et al. Rapid and Nondestructive Prediction of Major Quality Indicators of Kiwifruits Using Hyperspectral ImagingJ. Science and Technology of Food Industry, 2026, 47(6): 1−10. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2025020053.
Citation: SHANG Jing, LIU Zhiyang, TAN Tao, et al. Rapid and Nondestructive Prediction of Major Quality Indicators of Kiwifruits Using Hyperspectral ImagingJ. Science and Technology of Food Industry, 2026, 47(6): 1−10. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2025020053.

基于高光谱成像的猕猴桃主要品质指标的快速无损检测

Rapid and Nondestructive Prediction of Major Quality Indicators of Kiwifruits Using Hyperspectral Imaging

  • 摘要: 为实现猕猴桃主要品质指标(可溶性固形物含量、酸度、硬度和色差e值)的快速无损检测。利用高光谱成像系统采集猕猴桃的图像信息并提取感兴趣区域的原始光谱反射率,同时参照国标方法测定其主要品质指标参考值。分析四种光谱预处理方法(一阶导数、二阶导数、多元散射校正和标准正态变换(SNV))对原始光谱的预处理效果,并基于全光谱信息建立预测猕猴桃品质指标的偏最小二乘回归和主成分回归模型以确定较优的光谱预处理方法;然后,分别采用连续投影算法和竞争性自适应重加权算法(CARS)对全光谱信息进行降维处理以提升模型的运行效率和稳定性,将筛选的最优特征波长作为输入变量建立预测猕猴桃品质指标的多元线性回归(MLR)和误差反向传播神经网络模型;分析对比基于特征波长与全波长的建模结果,得出猕猴桃品质指标(可溶性固形物含量、酸度、硬度和色差e值)的最优预测模型为SNV-CARS-MLR模型,其中预测集相关系数Rp分别为0.9552、0.8870、0.8799和0.9079,均方根误差分别为0.9088、0.0715、2.3764和0.0285,剩余预测偏差分别为3.3800、2.0349、2.1350和2.2838,剩余预测偏差均大于2,表明模型的检测性能很好。最后,采用伪彩色技术,将猕猴桃高光谱图像上的像素点信息输入最优的SNV-CARS-MLR模型中,实现了猕猴桃各品质指标含量分布可视化,可以直观地显示出不同品质猕猴桃的差异化。综上,利用高光谱成像技术可以实现猕猴桃主要品质指标的快速无损检测。

     

    Abstract: In this study, hyperspectral imaging technology was used to achieve rapid and nondestructive detection of key quality indicators of kiwifruits, including soluble solids content, pH, firmness, and color e value. A hyperspectral imaging system was employed to capture hyperspectral images of kiwifruits, and the average spectral reflectance values from regions of interest were extracted for each sample. Simultaneously, reference values for the quality indicators were measured according to Chinese national standard methods. The original spectra were preprocessed using four methods: Second derivative, first derivative, multi-scatter calibration, and standard normal variation (SNV). Based on the full spectra, partial least-squares regression and principal component regression models were developed to predict kiwifruit quality indicators, and the optimal spectral preprocessing method was selected. To enhance model efficiency and stability, characteristic wavelengths were selected from the full spectra using a successive projections algorithm and competitive adaptive reweighted sampling (CARS). Multiple linear regression (MLR) and error back-propagation neural network models were then constructed using these selected characteristic wavelengths. Comparison of established models using the characteristic wavelengths with those utilizing the full spectra revealed that the SNV-CARS-MLR model had the best ability to assess kiwifruit quality indicators. Specifically, the prediction correlation coefficients (Rp) for soluble solids content, pH, firmness, and color e value were 0.9552, 0.8870, 0.8799, and 0.9079, respectively. The respective root mean square errors of the predictions were 0.9088, 0.0715, 2.3746, and 0.0285, and the respective residual predictive deviation (RPD) values were 3.3800, 2.0349, 2.1350 and 2.2838. All RPD values exceeded two, indicating strong model performance. Finally, pseudo-colouring was employed to input pixel information from hyperspectral images into the SNV-CARS-MLR model to visualise the distribution and compare kiwifruits of different quality grades. In conclusion, hyperspectral imaging technology enables rapid, nondestructive detection of key quality indicators in kiwifruits.

     

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