Fig. 6
From: Development of an accurate low cost NDVI imaging system for assessing plant health
Comparison of NDVI imaging with the Raspberry Pi, and NDVI as measured with a spectrometer. Red dashed line represents a 1:1 relationship with NDVI calculated from the spectrometer. Wheat (Yellow), Barley (Blue), and Phaseolus (Green). A NDVI imaging compared to spectrometry NDVI (n = 181). B Dataset with Phaseolus measurements omitted (n = 59). In all instances, the Raspberry Pi images demonstrate a good relationship (R2 > 0.89) with spectrometry derived NDVI, highlighting the robustness of the system