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Nondestructive evaluation of internal decay of avocado by X-ray and search for inhibition of fungal growth

Research Project

Project/Area Number 21K14943
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Koyama Kento  北海道大学, 農学研究院, 准教授 (60845907)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywordsカビ / 腐敗 / アボカド / 追熟 / X線画像 / 追熟過程 / X線 / 画像解析 / 機械学習 / 保存
Outline of Research at the Start

アボカド,マンゴーといった追熟が必要な農産物の内部の黒変を目視で早期に検出することは難しい。特に,茎の付け根から侵入したカビが原因となる内部黒変は追熟前に症状として現れないため検出が困難である。内部黒変の有無を評価するには果実の切断が必要となる。本研究では,X線画像を用いた非破壊でのアボカドの内部黒変の定量化とカビの増殖を抑制する保存条件を探索をおこなう。X線異物検査器は対象物の密度を測定できるため,カビが活動してできる空洞と内部黒変を検出できると考えられる。

Outline of Final Research Achievements

X-ray images were used to extract the rotten parts of avocados. As a result of the analysis, by introducing image analysis using deep learning, we were able to detect more than 90% of rotten fruit and to reveal the pattern of internal decay by X-ray. Furthermore, it was revealed that the progression of rotting varied greatly depending on the humidity at which the fruit was stored. Since the taste evaluation did not change significantly under low humidity conditions, ripening avocados under low humidity conditions would reduce mold damage while preserving good taste. This is a new attempt to track mold in fruit and has established a foundation to be used in comparative studies of storage methods for ripening fruit.

Academic Significance and Societal Importance of the Research Achievements

どのタイミングで腐敗が発生するのかが明らかになったので、選果の現場で利用できるリアルタイムのカビ被害調査に向けて準備を進められる。今後、アボカド以外の追熟果実においても内部腐敗の進行の解明および腐敗の対策が進むことにより、果物の廃棄量が減少することが期待される。

この研究では、X線画像を使用して、アボカドの内部果実腐敗の発達を非破壊的にモニタリングし、各果実の日々の腐敗の変化を比較し、アボカド内部の腐敗の時系列データを取得した。これにより、X線画像が内部欠陥の検査だけでなく、最適な処理や保存環境の調査にも重要な役割を果たす可能性が示された。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022

All Journal Article (2 results) Presentation (7 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Automated detection of internal fruit rot in Hass avocado via deep learning-based semantic segmentation of X-ray images2023

    • Author(s)
      Matsui Takahiro、Sugimori Hiroyuki、Koseki Shige、Koyama Kento
    • Journal Title

      Postharvest Biology and Technology

      Volume: 203 Pages: 112390-112390

    • DOI

      10.1016/j.postharvbio.2023.112390

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Development of automatic detection model for stem-end rots of ‘Hass’ avocado fruit using X-ray imaging and image processing2022

    • Author(s)
      Matsui Takahiro、Kamata Tatsuki、Koseki Shige、Koyama Kento
    • Journal Title

      Postharvest Biology and Technology

      Volume: 192 Pages: 111996-111996

    • DOI

      10.1016/j.postharvbio.2022.111996

    • Related Report
      2022 Research-status Report
  • [Presentation] Investigation of optimum postharvest fungal control condition in ripening of avocado through X-ray inspection2023

    • Author(s)
      Yoan Felanny Lembono, Takahiro Matsui, Shige Koseki, Kento Koyama
    • Organizer
      EFFoST International Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] When should avocados be inspected? The relationship between skin-color and internal fruit rot2023

    • Author(s)
      Takahiro Matsui,Shige Koseki,Kento Koyama
    • Organizer
      EFFoST International Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] X線画像と深層学習を用いた アボカドの内部腐敗の非破壊評価技術の開発2023

    • Author(s)
      松井 貴大,杉森 博行,小関成樹,小山健斗
    • Organizer
      農業食料工学会
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] X線画像によるアボカドの内部障害の自動検出手法の開発2022

    • Author(s)
      松井貴大、安部星、小関成樹
    • Organizer
      Fooma JAPAN 20222 アカデミックプラザ
    • Related Report
      2022 Research-status Report
  • [Presentation] Development of automatic detection model for stem-end rots of 'Hass' avocado fruits using X-ray imaging2022

    • Author(s)
      Takahiro Matsui, Shige Koseki, Kento Koyama
    • Organizer
      Annual international meeting ammerican society of agricultural and biological engineering
    • Related Report
      2022 Research-status Report
  • [Presentation] Development of automatic detection model for stem- end rots of ‘Hass’ avocado fruits using X-ray imaging2022

    • Author(s)
      Takahiro Matsui, Shige Koseki, and Kento Koyama.
    • Organizer
      Annual International Meeting, American Society of Agricultural and Biological Engineering
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] X 線画像によるアボカドの内部障害の自動判別手法の開発2022

    • Author(s)
      松井貴大,安部星,小関成樹,小山健斗
    • Organizer
      FOOMA JAPAN 2022 アカデミックプラザ
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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