Fig. 13

Predicting GreenSeeker values using mean canopy colour. A quadratic model has been used to predict GreenSeeker values recorded from all 60 plots. The black line represents perfect prediction, where reference values would match predicted values exactly. Light and dark blue circles represent where colour corrected images were used as training data for the prediction model, orange and red circles refer to the uncorrected images. a Using mean canopy colour in the HSV colour space for prediction. b Using mean canopy colour in RGB, Lab, HSV and Luv colour spaces for prediction