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| Bulanon, Duke M.; Burks, Thomas F.; Kim, Dae G.; Ritenour, Mark A.. |
| A recently discovered fungal disease called citrus black spot, is threatening the Florida citrus industry. The fungal disease, which causes cosmetic lesions on the rind of the fruit and can cause a tree to drop its fruit prematurely, could possibly lead to a ban on sales of fresh Florida citrus in other citrus-producing states. The objective of this research is to develop a multispectral imaging algorithm to detect citrus black spots based on hyperspectral image data. Hyperspectral images of citrus fruits (Valencias) were collected in the wavelength range of 480 nm to 950 nm. Five surface conditions were examined, citrus black spot, greasy spot, melanose, wind scar, and normal one. The first part of the image analysis determined the optimal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural Engineering citrus disease; Multispectral imaging; Hyperspectral imaging. |
| Ano: 2013 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2382 |
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| Fisher, Daniel K.; Sui, Ruixiu. |
| Liquid levels are measured in a variety of agricultural applications, and are often measured manually, which can be time-consuming and labor-intensive. Rapid advances in electronic technologies have made a variety of inexpensive sensing, monitoring, and control capabilities available. A monitoring system was developed and evaluated for automatic measurement of liquid levels, and demonstrated by monitoring water levels in evaporation pans used in evaporation studies and irrigation scheduling. The system is composed of an ultrasonic sensor, a microcontroller-based data logger, and a temperature sensor. The ultrasonic sensor measures the distance from the sensor to the liquid surface. Air temperature is measured by the temperature sensor, and is used to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Edge effect compensation; Hyperspectral imaging; Canker; Spatial correction; Geometric correction. |
| Ano: 2013 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2343 |
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| Jacq, Kévin; Perrette, Yves; Fanget, Bernard; Sabatier, Pierre; Coquin, Didier; Martinez-lamas, Ruth; Debret, Maxime; Arnaud, Fabien. |
| In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored sediment sample. It was applied to a sediment core of the well-known Lake Bourget (Western Alps, France) to develop and validate a model for downcore high resolution LOI550 measurements used as a proxy of the organic matter. In lake and marine sediment, the organic matter content is widely used, for example, to reconstruct carbon flux variations through time. Organic matter analysis through routine analysis methods... |
| Tipo: Text |
Palavras-chave: Hyperspectral imaging; Chemometrics; Near-infrared spectroscopy; High resolution analysis; Organic matter. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00478/59018/61636.pdf |
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| Androuin, Thibault; Polerecky, Lubos; Decottignies, Priscilla; Dubois, Stanislas; Dupuy, Christine; Hubas, Cedric; Jesus, Bruno; Le Gall, Erwan; Marzloff, Martin; Carlier, Antoine. |
| The slipper limpet Crepidula fornicata is an emblematic invasive species along the northeast Atlantic coast. This gregarious gastropod lives in stacks of several individuals and forms extended beds in shallow subtidal areas. The effects of this engineer species on the colonized habitat can be physical (e.g., presence of hard-shell substrates with uneven topography) or biological (e.g., nutrient enrichment by direct excretion or via biodeposition). We hypothesized that through biological activity, nutrient fluxes at the sediment-water interface are enhanced, leading to stimulated primary productivity by microphytobenthos (MPB) associated with Crepidula beds. To test this fertilization hypothesis, we conducted a 10-day mesocosm experiment using C. fornicata... |
| Tipo: Text |
Palavras-chave: Crepidula fornicata; Engineer species; Subtidal microphytobenthos; Fertilization; Hyperspectral imaging. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00472/58338/60893.pdf |
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