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富士蘋果采收成熟度光譜無損預測模型對比分析
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國家自然科學基金項目(31701664)、中國博士后科學基金項目(2017M623254)和陜西省重點研發(fā)計劃項目(2017ZDXM-NY-017)


Comparative Analysis of Harvest Maturity Model for Fuji Apple Based on Visible/Near Spectral Nondestructive Detection
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    摘要:

    針對蘋果采收成熟度不一,,導致果品貯藏品質(zhì)不佳,、病害率高等問題,,基于可見/近紅外光譜和成熟度評價指數(shù)建立快速無損判別采收成熟度的分類模型,。根據(jù)盛花期后的發(fā)育時間,,采集了3種成熟階段(八成熟,、九成熟和十成熟)樣品的光譜信息,。光譜預處理后通過“二審”回收算子法剔除異常樣本,,隨機蛙跳(RF)算法提取特征變量,,建立成熟度評價指數(shù)SIQI和綜合評價指標FQI的偏最小二乘(PLSR)模型,SIQI指數(shù)和FQI指數(shù)的預測相關(guān)系數(shù)R為0.938和0.917,。建立極限學習機(ELM)和支持向量回歸(SVR)分類模型,,并與2種成熟度評價指數(shù)結(jié)合SVR建立的分類結(jié)果進行比較。對比4種分類結(jié)果發(fā)現(xiàn),,基于SIQI+SVR構(gòu)建的分類結(jié)果最好,,優(yōu)于直接分類模型,分類準確率為 85.71%,。試驗結(jié)果表明,,可見/近紅外光譜結(jié)合成熟度評價指數(shù)可實現(xiàn)蘋果成熟度分類,為后續(xù)采收成熟度的無損檢測設備研發(fā)提供理論參考,。

    Abstract:

    Harvest maturity is a key factor affecting apple storage performance. Thus, in order to achieve batch harvesting and suitable picking maturity of apple, rapid and non-destructive discrimination model was studied based on visible/near infrared spectral technology. Apple samples were classified into three maturity levels (mid-ripe, ripe and over-ripe) according to different fruit development times after flowering. Spectral information of all samples was acquired by using the visible/near-infrared spectral system with a wavelength range from 200nm to 1100nm in the laboratory, and spectral differences of samples at different mature stages were analyzed. It was found that the spectral reflectance of the mid-ripe samples was significantly higher than that of the ripe and over-ripe samples. However, the spectral bands behind the ripe and over-ripe samples had similar spectral characteristics, resulting in overlapping. Then, after the preprocessing of SG and multivariate scatter correction method, a method using callback arithmetic operator named twice-detect was used to detect outlier sample for different quality parameters. Among them, five outlier samplers of the soluble solids content, two outlier samples of firmness and no outlier sampler in color factor were removed. Finally, the remaining 235 samples were participated in the modeling analysis. The characteristic variables of soluble solids, firmness and the parameters of L*, C*, h*, a andb were extracted by the random algorithm which can be modeled with a small number of variables. A maturity index coupling internal quality named simplified internal quality index (SIQI) and another maturity index coupling with factor analysis named factor quality index (FQI) were applied to evaluate the maturity of apple. Using the characteristic variable as input, the partial least squares prediction model of SIQI index and FQI index was established. The prediction correlation coefficient of SIQI index was 0.938, and the root mean square error was 0.216. Similarly, the prediction correlation coefficient of FQI index was 0.917 and the root mean square error was 1.152. Therefore, it was feasible to use spectral information to predict the maturity evaluation index of coupled multiple indexes. At the same time, the classification model using spectral information was directly established by the extreme learning machine (ELM) algorithm and the support vector regression (SVR) algorithm. By comparing the results of the four classification models, it was found that the classification results based on SIQI index combined with SVR algorithm were the best, which was better than the direct classification model. The classification accuracy was 85.71%. The results stated that the classification of apple harvest maturity can be achieved by using visible/near-infrared spectroscopy information and the maturity evaluation index coupling with related internal quality indicators. The research result can provide a theoretical reference for the development of nondestructive testing equipment for subsequent apple harvesting maturity.

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趙娟,全朋坤,馬敏娟,李磊,何東健,張海輝.富士蘋果采收成熟度光譜無損預測模型對比分析[J].農(nóng)業(yè)機械學報,2018,49(12):347-354. ZHAO Juan, QUAN Pengkun, MA Minjuan, LI Lei, HE Dongjian, ZHANG Haihui. Comparative Analysis of Harvest Maturity Model for Fuji Apple Based on Visible/Near Spectral Nondestructive Detection[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(12):347-354.

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  • 收稿日期:2018-09-13
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  • 在線發(fā)布日期: 2018-12-10
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