Abstract
Fungi infections, which cause variations in plant surface temperatures, can be recognised by infrared cameras within the thermal range (MIR) under laboratory conditions. In the field, pronounced natural temperature variations of several Kelvin within the crop canopy prevent the recognition of infected plants through commercial thermal vision systems as stand-alone solutions. Near infrared (NIR) cameras fitted with band-pass filters show different intensity distributions of the reflected radiation. Assessing the spectral intensity relations improves the differentiation. Through NIR the surface tissue cell ingredients are measured, and thermography determines the plant transpiration rate.
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