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( Hoyoung Lee ),( Chun Chieh Yang ),( Moon S. Kim ),( Jongguk Lim ),( Byoung Kwan Cho ),( Alan Lefcourt ),( Kuanglin Chao ),( Colm D. Everard ) 한국농업기계학회 2014 바이오시스템공학 Vol.39 No.2
Purpose: A multispectral algorithm for detection and differentiation of defective (defects on apple skin) and normal Red Delicious apples was developed from analysis of a series of hyperspectral line-scan images. Methods: A fast line-scan hyperspectral imaging system mounted on a conventional apple sorting machine was used to capture hyperspectral images of apples moving approximately 4 apples per second on a conveyor belt. The detection algorithm included an apple segmentation method and a threshold function, and was developed using three wavebands at 676 nm, 714 nm and 779 nm. The algorithm was executed on line-by-line image analysis, simulating online real-time line-scan imaging inspection during fruit processing. Results: The rapid multispectral algorithm detected over 95% of defective apples and 91% of normal apples investigated. Conclusions: The multispectral defect detection algorithm can potentially be used in commercial apple processing lines.
Development of broadband NIR LED module for NIR spectroscopy
( Hoyoung Lee ),( Ahyeong Lee ),( Doo-jin Song ),( Seung-woo Chun ),( Jongguk Lim ),( Changyeun Mo ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
In NIR spectroscopy and hyperspectral imaging, the light source is one of the important requirements. The Tungsten-Halogen lamp is a common light source for NIR radiation, which is operated at high temperatures and takes a long time to warm up until stabilization of its radiation. The power requirement is addressed by generating radiation, and extra-heating inside of bulb, as well. It turns out to have low power efficiency, and large volume for heat dissipation. In order to miniaturize NIR spectral system and hyperspectral imaging system, a light source must be found for the new alternative. There are many candidates in commercial, so called broadband NIR LED, which have better power efficiency, and lower operating temperature. In this study, we developed the test apparatus for several broadband NIR LEDs, and perform the comparison between them in terms of spectral radiation ranging of 700nm-1000nm. And then, as a light source of VIS-NIR spectroscopy(500nm-1000nm), the VIS+NIR LED module was developed with combination of warm-white LED and broadband LEDs. Using that, the spectrum transmitted through Fuji apple was acquired to investigate the potential to replace the TH-lamp. It shows the possibility that a TH-lamp is replaceable of the VIS+NIR LED module for VIS-NIR spectroscopy.
Development of broadband NIR LED module for NIR spectroscopy
( Hoyoung Lee ),( Ahyeong Lee ),( Doo-jin Song ),( Seung-woo Chun ),( Jongguk Lim ),( Changyeun Mo ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
In NIR spectroscopy and hyperspectral imaging, the light source is one of the important requirements. The Tungsten-Halogen lamp is a common light source for NIR radiation, which is operated at high temperatures and takes a long time to warm up until stabilization of its radiation. The power requirement is addressed by generating radiation, and extra-heating inside of bulb, as well. It turns out to have low power efficiency, and large volume for heat dissipation. In order to miniaturize NIR spectral system and hyperspectral imaging system, a light source must be found for the new alternative. There are many candidates in commercial, so called broadband NIR LED, which have better power efficiency, and lower operating temperature. In this study, we developed the test apparatus for several broadband NIR LEDs, and perform the comparison between them in terms of spectral radiation ranging of 700nm-1000nm. And then, as a light source of VIS-NIR spectroscopy(500nm-1000nm), the VIS+NIR LED module was developed with combination of warm-white LED and broadband LEDs. Using that, the spectrum transmitted through Fuji apple was acquired to investigate the potential to replace the TH-lamp. It shows the possibility that a TH-lamp is replaceable of the VIS+NIR LED module for VIS-NIR spectroscopy.
Development of multispectral imaging algorithm for detection of frass on mature red tomatoes
Yang, Chun-Chieh,Kim, Moon S.,Millner, Patricia,Chao, Kuanglin,Cho, Byoung-Kwan,Mo, Changyeun,Lee, Hoyoung,Chan, Diane E. Elsevier 2014 Postharvest biology and technology Vol.93 No.-
In this research, a multispectral fluorescence-based imaging algorithm was developed to detect frass contamination on mature Campari tomatoes. Tomato images were acquired using a hyperspectral fluorescence line-scan imaging system with violet LED excitation, then analyzed for wavelength selection. The fluorescence intensities at five wavelengths, 515 nm, 640 nm, 664 nm, 690 nm, and 724 nm, were used to compute three simple ratio functions to detect frass contamination. The contamination spots were created on the tomato surfaces using four low-concentration frass dilutions. The algorithms detected over 99% of the 0.2 kg/L and 0.1 kg/L frass contamination spots and successfully differentiated these spots from tomato skin surfaces, stem scars, and stems. However, differentiation of the 0.05 kg/L and 0.02 kg/L frass contamination spots was more difficult. Adjusting the algorithm to successfully detect 95% of the 0.05 kg/L spots also resulted in false-positive pixel detections occurring on 28% of the tomatoes. This study demonstrates that a simple multispectral fluorescence imaging algorithm based on violet LED excitation could be useful for rapid postharvest detection of frass contamination on tomatoes in processing lines. (C) 2014 Published by Elsevier B.V.
A Simple Multispectral Imaging Algorithm for Detection of Defects on Red Delicious Apples
Lee, Hoyoung,Yang, Chun-Chieh,Kim, Moon S.,Lim, Jongguk,Cho, Byoung-Kwan,Lefcourt, Alan,Chao, Kuanglin,Everard, Colm D. Korean Society for Agricultural Machinery 2014 바이오시스템공학 Vol.39 No.2
Purpose: A multispectral algorithm for detection and differentiation of defective (defects on apple skin) and normal Red Delicious apples was developed from analysis of a series of hyperspectral line-scan images. Methods: A fast line-scan hyperspectral imaging system mounted on a conventional apple sorting machine was used to capture hyperspectral images of apples moving approximately 4 apples per second on a conveyor belt. The detection algorithm included an apple segmentation method and a threshold function, and was developed using three wavebands at 676 nm, 714 nm and 779 nm. The algorithm was executed on line-by-line image analysis, simulating online real-time line-scan imaging inspection during fruit processing. Results: The rapid multispectral algorithm detected over 95% of defective apples and 91% of normal apples investigated. Conclusions: The multispectral defect detection algorithm can potentially be used in commercial apple processing lines.
Dual Effect of Nerve Growth Factor on Cell Death of PC12 Cells Induced by Serum Deprivation
KyuChung Hur,Mijung Kwon,Sooryun Seo,Hoyoung Chun,Jun-Mo Chung,In Kwon Chung 한국분자세포생물학회 2002 Molecules and cells Vol.13 No.2
The effect of nerve growth factor (NGF) on the cell death of PC12 cells that is induced by serum deprivation was examined in the floating and attached cells to the extracellular matrix. NGF suppressed cell death occurred in the floating cells. The onset of cell death in the attached cells was much slower than in the floating cells. Moreover, the cell death in the attached cells was either accelerated in a high-density culture (over ~50% confluent), or inhibited in a low-density culture by NGF. While nucleosomal DNA fragmentation and poly (ADP-ribose) polymerase degradation was observed in both the floating and attached cells, the incidence of nuclear fragmentation and chromatin condensation was much lower in the attached cells than in the floating cells. The delayed onset of cell death in the attached cells was due to the signals that are generated from the extracellular matrix that is formed by PC12 cells, together with cell-to-cell interaction. The acceleration of cell death in the NGF-treated cells was anoikis, caused by the loss of the anchorage of the cell via the action of increased activities of matrix metalloproteinases (MMP2, MMP9). These results suggest that NGF has a different role in the cell death of PC12 cells that is induced by serum deprivation, depending on the cell-matrix, as well as the cell-cell interaction.