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Quality evaluation of tea leaves using machine learning and hyperspectral reflectance

Research Project

Project/Area Number 19K06313
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 41040:Agricultural environmental engineering and agricultural information engineering-related
Research InstitutionShizuoka University

Principal Investigator

Sonobe Rei  静岡大学, 農学部, 助教 (40755352)

Co-Investigator(Kenkyū-buntansha) 廣野 祐平  国立研究開発法人農業・食品産業技術総合研究機構, 果樹茶業研究部門, 上級研究員 (10391418)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords分光反射特性 / チャノキ / 機械学習 / 茶葉 / クロロフィル / アミノ酸 / カテキン / ドローン / テアニン / ハイパースペクトル
Outline of Research at the Start

本課題では,リモートセンシングによる茶葉の生葉段階での品質・ストレス評価手法の確立,さらには,最適な直がけ被覆の実施を可能とする手立てを提案する。
茶樹に直がけ被覆を施し弱光下で栽培する方法があり,茶葉の品質向上に有効である一方で,収量の低下及びストレスの蓄積に伴う枯死を引き起こすことがある。よって,持続的な運用には被覆のタイミングや程度の微妙な制御といったプロのスキルが必要となる。しかし,後継者不足により現在までに培われてきたプロの技が消失しつつある。本課題では分光反射特性という客観的なデータを活用することによって経験が浅くとも実践できる技術を開発する。

Outline of Final Research Achievements

Tea trees are kept in shaded locations to increase their chlorophyll content and theanine, which influence green tea quality. Therefore, monitoring changes in chlorophyll and theanine content under low light conditions is important for managing tea trees and producing high-quality green tea.
Hyperspectral remote sensing offers an efficient way to monitor biochemical properties. Thus we examined the potential of hyperspectral data for estimating chlorophyll and theanine conten.

Academic Significance and Societal Importance of the Research Achievements

品質の向上と安定的な収量の維持のトレードオフ関係への解を得るうえで有効となる茶葉の生葉段階における品質とストレスの同時評価手法の確立を,分光反射特性と機械学習アルゴリズムを用いることによって実現する.
現在まで茶樹の適切な管理には,経験を積んで培われてきたプロのスキルが必要であった.しかし,高齢化,後継者不足によりこれらの技術の消失が危惧されている.本研究では,分光反射特性という客観的なデータを用いて同等の成果の達成を試みる研究であり,将来における高付加価値農作物の安定的な産出に貢献できると考えられる.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (29 results)

All 2021 2020 2019

All Journal Article (12 results) (of which Peer Reviewed: 12 results,  Open Access: 12 results) Presentation (15 results) (of which Int'l Joint Research: 5 results) Book (2 results)

  • [Journal Article] Use of spectral reflectance from a compact spectrometer to assess chlorophyll content in Zizania latifolia2021

    • Author(s)
      Sonobe Rei、Yamashita Hiroto、Adenan Yandra Nofrizal、Seki Haruyuki、Morita Akio、Ikka Takashi
    • Journal Title

      Geocarto International

      Volume: - Issue: 18 Pages: 1-13

    • DOI

      10.1080/10106049.2021.1914747

    • NAID

      120007034479

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hyperspectral wavelength selection for estimating chlorophyll content of muskmelon leaves2021

    • Author(s)
      Sonobe Rei、Sugimoto Yudai、Kondo Ryohei、Seki Haruyuki、Sugiyama Erika、Kiriiwa Yoshikazu、Suzuki Katsumi
    • Journal Title

      European Journal of Remote Sensing

      Volume: 54 Issue: 1 Pages: 513-524

    • DOI

      10.1080/22797254.2021.1964383

    • NAID

      120007146066

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Potential of spectroscopic analyses for non-destructive estimation of tea quality-related metabolites in fresh new leaves2021

    • Author(s)
      Yamashita Hiroto、Sonobe Rei、Hirono Yuhei、Morita Akio、Ikka Takashi
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 4169-4169

    • DOI

      10.1038/s41598-021-83847-0

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Quantifying chlorophyll-a and b content in tea leaves using hyperspectral reflectance and deep learning2020

    • Author(s)
      Sonobe Rei、Hirono Yuhei、Oi Ayako
    • Journal Title

      Remote Sensing Letters

      Volume: 11 Issue: 10 Pages: 933-942

    • DOI

      10.1080/2150704x.2020.1795294

    • NAID

      120006872378

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Estimation of Leaf Chlorophyll a, b and Carotenoid Contents and Their Ratios Using Hyperspectral Reflectance2020

    • Author(s)
      Sonobe Rei、Yamashita Hiroto、Mihara Harumi、Morita Akio、Ikka Takashi
    • Journal Title

      Remote Sensing

      Volume: 12 Issue: 19 Pages: 3265-3265

    • DOI

      10.3390/rs12193265

    • NAID

      120006890005

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dissection of hyperspectral reflectance to estimate nitrogen and chlorophyll contents in tea leaves based on machine learning algorithms2020

    • Author(s)
      Yamashita Hiroto、Sonobe Rei、Hirono Yuhei、Morita Akio、Ikka Takashi
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 17360-17360

    • DOI

      10.1038/s41598-020-73745-2

    • NAID

      120006891195

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hyperspectral reflectance sensing for quantifying leaf chlorophyll content in wasabi leaves using spectral pre-processing techniques and machine learning algorithms2020

    • Author(s)
      Sonobe Rei、Yamashita Hiroto、Mihara Harumi、Morita Akio、Ikka Takashi
    • Journal Title

      International Journal of Remote Sensing

      Volume: 42 Issue: 4 Pages: 1311-1329

    • DOI

      10.1080/01431161.2020.1826065

    • NAID

      120006939599

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Non-Destructive Detection of Tea Leaf Chlorophyll Content Using Hyperspectral Reflectance and Machine Learning Algorithms2020

    • Author(s)
      Sonobe Rei、Hirono Yuhei、Oi Ayako
    • Journal Title

      Plants

      Volume: 9 Issue: 3 Pages: 368-368

    • DOI

      10.3390/plants9030368

    • NAID

      120006816582

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Parcel-Based Crop Classification Using Multi-Temporal TerraSAR-X Dual Polarimetric Data2019

    • Author(s)
      Sonobe Rei
    • Journal Title

      Remote Sensing

      Volume: 11 Issue: 10 Pages: 1148-1148

    • DOI

      10.3390/rs11101148

    • NAID

      120006627901

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Combining ASNARO-2 XSAR HH and Sentinel-1 C-SAR VH/VV Polarization Data for Improved Crop Mapping2019

    • Author(s)
      Sonobe Rei
    • Journal Title

      Remote Sensing

      Volume: 11 Issue: 16 Pages: 1920-1920

    • DOI

      10.3390/rs11161920

    • NAID

      120006713028

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] PROSPECTを用いた茶葉におけるクロロフィル含量の評価2019

    • Author(s)
      林明日香、薗部礼、佐野智人、堀江秀樹
    • Journal Title

      写真測量とリモートセンシング

      Volume: 58 Pages: 260-264

    • NAID

      130007933557

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 分光反射特性による茶葉に含まれるテアニン含量推定能力の評価2019

    • Author(s)
      薗部礼、佐野智人、堀江秀樹
    • Journal Title

      写真測量とリモートセンシング

      Volume: 58 Pages: 265-269

    • NAID

      130007933560

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Quantification of chlorophyll content in tomato leaves using a compact spectrometer.2021

    • Author(s)
      Rei Sonobe, Haruyuki Seki, Shogo Kodama, Takuma Okitsu, Yudai Sugimoto, Yoshikazu Kiriiwa, Katsumi Suzuki
    • Organizer
      International Symposium on Remote Sensing 2021(ISRS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Retrieval of Silica Content from Hyperspectral Reflectance.2021

    • Author(s)
      Adenan Yandra Nofrizal, Rei Sonobe, Hiroto Yamashita, Akio Morita, Takashi Ikka
    • Organizer
      International Symposium on Remote Sensing 2021(ISRS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Prediction Chlorophyll Content of Zizania Latifolia Using Hyperspectral data and Machine Learning.2021

    • Author(s)
      Adenan Yandra Nofrizal, Rei Sonobe, Hiroto Yamashita, Akio Morita, Takashi Ikka
    • Organizer
      The second Intercontinental Geoinformation Days (IGD2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 分光反射特性を用いたワサビ葉のクロロフィル/カロテノイド含量比の評価2021

    • Author(s)
      薗部 礼・山下寛人・三原春美・森田明雄・一家崇志
    • Organizer
      日本写真測量学会令和3年度年次学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Estimating chlorophyll content in leaves using UAV-mounted spectroscopic sensor2021

    • Author(s)
      Tatsuya Shirai, Rei Sonobe, Haruyuki Seki, Akiyoshi Tominaga, Kan-ichiro Mochizuki, Genya Saito
    • Organizer
      International Symposium on Agricultural Meteorology 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Assessment of the PROSPECT-PRO model capabilities using hyperspectral reflectance of melon leaves2021

    • Author(s)
      Rei Sonobe, Haruyuki Seki, Ryohei Kondo, Yudai Sugimoto, Yoshikazu Kiriiwa, Katsumi Suzuki
    • Organizer
      International Symposium on Agricultural Meteorology 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 分光反射指数を用いた被覆茶のカロテノイド含量推定2020

    • Author(s)
      薗部礼,廣野祐平,大井彩子
    • Organizer
      日本写真測量学会令和2年度年次学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 機械学習を用いた茶葉の窒素とクロロフィル濃度を推定するハイパースペクトルデータの解剖2020

    • Author(s)
      山下寛人,薗部礼,廣野祐平,森田明雄,一家崇志
    • Organizer
      2020年度日本土壌肥料学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 連続体除去を用いた分光反射特性による被覆茶のクロロフィル含量推定2020

    • Author(s)
      薗部礼,廣野祐平,大井彩子
    • Organizer
      日本写真測量学会令和2年度秋季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 放射伝達モデルに基づく被覆茶のクロロフィル含量評価2020

    • Author(s)
      薗部礼、廣野祐平、大井彩子
    • Organizer
      日本農業気象学会2020年全国大会
    • Related Report
      2019 Research-status Report
  • [Presentation] ミニ分光器を活用したブドウ葉のクロロフィル含量評価2020

    • Author(s)
      近藤凌平、関晴之、薗部礼、齋藤元也、小杉幸夫
    • Organizer
      日本農業気象学会2020年全国大会
    • Related Report
      2019 Research-status Report
  • [Presentation] UAV搭載ハイパースペクトルセンサを用いたヤーコンのクロロフィル含量測定2020

    • Author(s)
      白井達也、関晴之、薗部礼、富永晃好、王権、齋藤元也、望月貫一郎
    • Organizer
      日本農業気象学会2020年全国大会
    • Related Report
      2019 Research-status Report
  • [Presentation] KELMによる分光反射特性からの茶葉内光合成色素含量推定2019

    • Author(s)
      薗部礼、佐野智人、堀江秀樹
    • Organizer
      日本写真測量学会令和元年度年次学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] クロロフィル含量推定を目的とした分光反射指数の評価2019

    • Author(s)
      薗部礼、王権
    • Organizer
      日本写真測量学会令和元年度年次学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] iPLSを用いた分光反射特性によるブナの蒸散速度評価2019

    • Author(s)
      薗部礼、小林真也、王権
    • Organizer
      日本写真測量学会令和元年度秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Book] 農業気象学入門2021

    • Author(s)
      鮫島 良次
    • Total Pages
      320
    • Publisher
      文永堂出版
    • ISBN
      9784830041419
    • Related Report
      2020 Research-status Report
  • [Book] 山岳科学2020

    • Author(s)
      松岡 憲知、泉山 茂之、楢本 正明、松本 潔
    • Total Pages
      127
    • Publisher
      古今書院
    • ISBN
      9784772242172
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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