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An inexpensive open-source ultrasonic sensing system for monitoring liquid levels CIGR Journal
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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Edge effect compensation for citrus canker lesion detection due to light source variation – a hyperspectral imaging application CIGR Journal
Niphadkar, Nikhil P.; Burks, Thomas F.; Qin, Jianwei; Ritenour, Mark.
The spread of citrus canker has become one of the most important challenges faced by Florida Fresh Market citrus is affecting the export of citrus fruits to several international markets including European countries.  Previous studies have shown that automated detection systems can help detect citrus canker infected fruit and could assist in eliminating the detected fruit from shipment to closed markets.  Most automated detection systems use some form of machine vision with artificial light sources.  However, when capturing images of spherical objects, non-uniform illumination results in an edge blackening effect resulting in higher misclassification rate.  The basic objective of this research was to implement a compensation algorithm to eliminate the edge...
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/2278
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