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油桃外部缺陷的高光譜成像檢測
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國家自然科學基金資助項目(31271973,、31171599)和山西省自然科學基金資助項目(2012011030-3)


Application of Hyperspectral Imaging for Detection of Defective Features in Nectarine Fruit
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    摘要:

    采用高光譜(420~1000nm)成像技術對“中油9號”油桃的4種外部缺陷(裂紋果、銹病果、異形果和暗傷果)進行檢測判別,。對400個樣本(4種外部缺陷樣本和完好樣本)運用偏最小二乘回歸(PLSR)從全波段中分別提取了10條特征波長,,分別為497,、534,、657,、677,、696,、709、745,、823,、868、943nm,。缺陷樣本的高光譜圖像經(jīng)過主成分分析后,,對876nm下的單波段圖像通過掩膜、Sobel算子處理,,并對主成分圖像經(jīng)過區(qū)域生長算法實現(xiàn)缺陷樣本的缺陷區(qū)域分割,。對光譜數(shù)據(jù)進行主成分分析得到前10個主成分值,并對圖像數(shù)據(jù)采用灰度共生矩陣(GLCM)提取得到6項圖像紋理指標(均值,、對比度,、相關性,、能量、同質(zhì)性,、熵值),。將主成分值和紋理值融合建立極限學習機(ELM)模型對油桃外部缺陷進行檢測判別。結(jié)果表明,,該模型對缺陷樣本的判別正確率為91.67%,,完好樣本的正確率為100%。

    Abstract:

    Hyperspectral imaging, an emerging analytical technology for quality and safety inspections of agricultural and sideline products, combines the advantages of digital image or computer vision with spectroscopy technology in the whole system. Hyperspectral imaging can simultaneously acquire both spatial and spectral information, which deliver chemical, structural and functional information from the samples. In this work, hyperspectral imaging technology was applied to determine a classifier that can be used for nondestructive defection of the defective features in “No.9 of Zhongyou” nectarine fruit. There were 400 samples from a nectarine planting garden in the Wanan Village in Yuncheng City of Shanxi Province, China, including: crack(50), peel spots(50), malformation(50), hidden damage(50) and normal(200) samples. Hyperspectral imaging technology covered the range of 420~1000nm was employed to detect defects (crack, peel spots, malformation and hidden damage) of nectarine fruit. 400 RGB images were acquired through a total of 400 samples, which included four types of defective features and sound samples. After acquiring hyperspectral images of nectarine fruits, the spectral data were extracted from region of interest (ROI). Using Kennard-Stone algorithm, all kinds of samples were randomly divided into training set (280) and testing set (120). First of all, based on the calculation of partial least squares regression (PLSR), 10 wavelengths at 497nm, 534nm, 657nm, 677nm, 696nm, 709nm, 745nm, 823nm, 868nm and 943nm were selected as the optimal sensitive wavelengths (SWs), respectively. Subsequently, the image of the 876nm wavelength was named as the feature image, then principal component analysis (PCA), mask process, “Sobel” edge detector and “region grow” algorithm were carried out among defective and normal nectarines to extract the defective region. Moreover, ten principal components (PCs) were selected based on PCA, and seven textural feature variables (mean, contrast, correlation, energy, homogeneity and entropy) were extracted by using gray level cooccurrence matrix (GLCM), respectively. Finally, the ability of hyperspectral imaging technique was tested by using the extreme learning machine (ELM) models. The ELM classification model was built based on the combination of PCs and textural features. The results show the correct discrimination accuracy of defective samples was 91.67%, and the correct discrimination accuracy of normal samples was 100%. The research revealed that the hyperspectral imaging technique is a promising tool for detecting defective features in nectarine, which could provide a theoretical reference and basis for designing classification system of fruits in further work.

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黃鋒華,張淑娟,楊 一,滿 尊,張學豪,吳玉香.油桃外部缺陷的高光譜成像檢測[J].農(nóng)業(yè)機械學報,2015,46(11):252-259. Huang Fenghua, Zhang Shujuan, Yang Yi, Man Zun, Zhang Xuehao, Wu Yuxiang. Application of Hyperspectral Imaging for Detection of Defective Features in Nectarine Fruit[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(11):252-259.

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  • 收稿日期:2015-04-13
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  • 在線發(fā)布日期: 2015-11-10
  • 出版日期: 2015-11-10
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