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基于近紅外高光譜成像的獼猴桃早期隱性損傷識(shí)別
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江蘇省農(nóng)產(chǎn)品物理加工重點(diǎn)實(shí)驗(yàn)室開放基金資助項(xiàng)目(JAPP-2012-4)和國(guó)家自然科學(xué)基金資助項(xiàng)目(31171720)


Recognition of Early Hidden Bruises on Kiwifruits Based on Near-infrared Hyperspectral Imaging Technology
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    摘要:

    為了研究識(shí)別早期隱性損傷獼猴桃的方法,,以“華優(yōu)”獼猴桃為對(duì)象,,以900~1700nm范圍近紅外高光譜成像系統(tǒng)為檢測(cè)設(shè)備,,采集了完好無損和隱性損傷1~3h內(nèi)獼猴桃的近紅外高光譜,。研究發(fā)現(xiàn)900~1350nm內(nèi)二者的反射光譜具有明顯的差異,。對(duì)此區(qū)域進(jìn)行分段主成分分析,,確定1050~1200nm為識(shí)別損傷的最佳光譜區(qū)域,?;诖俗罴压庾V區(qū)域內(nèi)主成分圖像的權(quán)重系數(shù)及波長(zhǎng)間光譜反射值的相關(guān)性優(yōu)選了4個(gè)特征波長(zhǎng)(1057,、1090,、1120和1177nm)。對(duì)該4個(gè)特征波長(zhǎng)進(jìn)行了二次主成分分析,并結(jié)合中值濾波,、閾值分割及數(shù)學(xué)形態(tài)學(xué)處理方法提出了早期隱性損傷獼猴桃的識(shí)別算法,。該算法對(duì)70個(gè)無損獼猴桃和70個(gè)隱性損傷獼猴桃的正確識(shí)別率分別為100%和95.7%,平均正確識(shí)別率為97.9%,。研究結(jié)果表明,,近紅外高光譜成像技術(shù)可用于早期隱性損傷獼猴桃的識(shí)別。

    Abstract:

    To recognize early hidden bruises on kiwifruits, taking ‘Huayou’ kiwifruits as research object and near-infrared (NIR) hyperspectral imaging system as detection device, the NIR hyperspectral image of kiwifruits with no bruises and hidden bruises damaged in 3h were collected. The sample images were covered a wavelength of 900~1700nm. It was found that the no bruises and hidden bruises kiwifruits had obvious reflectance value between 900nm and 1350nm. Principal component analysis (PCA) was conducted on this spectral region, and it was found that 1050~1200nm was the optimal band for identifying kiwifruits with hidden bruises. Based on the weight coefficients of the principal component (PC) images in the optimal band and their correlation coefficients of reflection values between wavelengths, four characteristic wavelengths, i.e. 1057, 1090, 1120 and 1177nm, were extracted. After a secondary PCA, median filtering, threshold segmentation and mathematical morphology, recognition algorithm of kiwifruits with hidden bruises were proposed and then applied on 70 no bruises and 70 hidden bruises kiwifruits. Results showed that the correct identification rates for no bruises kiwifruits and hidden bruises kiwifruits reached to 100% and 95.7%, respectively. The average identification rate was 97.9%. This study indicates that NIR hyperspectral imaging technology is effective for identifying kiwifruits with early hidden bruises. Its results provide basic data for developing online detection system for bruised kiwifruits.

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遲 茜,王轉(zhuǎn)衛(wèi),楊婷婷,劉大洋,郭文川.基于近紅外高光譜成像的獼猴桃早期隱性損傷識(shí)別[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(3):235-241. Chi Qian, Wang Zhuanwei, Yang Tingting, Liu Dayang, Guo Wenchuan. Recognition of Early Hidden Bruises on Kiwifruits Based on Near-infrared Hyperspectral Imaging Technology[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(3):235-241.

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  • 收稿日期:2014-07-07
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  • 在線發(fā)布日期: 2015-03-10
  • 出版日期: 2015-03-10
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