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ISHS Acta Horticulturae 1314: International Symposium on Precision Management of Orchards and Vineyards

TURF-BOX: an active lighting multispectral imaging system with led VIS-NIR sources for monitoring of vegetated surfaces

Authors:   A. Motisi, G. Impollonia, M. Minacapilli, S. Orlando, M. Sarno
Keywords:   multispectral camera, vegetation indices, NDVI, image analysis, spectral reflectance
DOI:   10.17660/ActaHortic.2021.1314.48
Abstract:
A microcontroller driven system suitable to monitor soil and low vegetation is described. A radiometrically pre-calibrated imaging camera driven by a microcontroller is contained in a light-tight box aiming at an actively illuminated target surface area of 50×38 cm, using LED sources with different emission wavelengths (blue, green, red and infrared). The adopted arrangement allows measurements independent from local lighting conditions and from the in situ, per-session calibrations necessary with the conventional instrumentation adopted for field measurements. Sequential lighting of the target surface with the monochromatic LED sources allows capturing multispectral images at a relatively high resolution (1269×972 px) in the broadband visible (VIS, 420-670 nm), monochromatic (blue, green, red) and near-infrared (NIR, 820 nm) domains, useful for the characterization of surfaces of different nature such as soil, turf, and low-vegetation. A specialized firmware implements, in a web-based user interface, functions for estimation of standard spectral parameters and vegetation indices, suitable for the characterization of vegetated surfaces and the diagnosis of specific conditions, anomalies or pathologies. The system is intended for use both in a research environment and in the technical management of recreation or cultivated surfaces, both for direct use and as a calibrated reference in support to proximal-sensing and/or drone-based applications.

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