Agribotix conducted a test of two vegetation indices, VARI and TGI, that use only the three visible-band signals from an unmodified CMOS camera. The results were compared to NDVI, which is generally considered to be a reliable measure of field health and the underlying RGB image. While the results are somewhat encouraging in limited cases, it is clear that neither VARI nor TGI are applicable as general-purposes measures of field health.
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