R, G and B values was similar, the higher the coefficient was, the higher its importance for determining the class would be. Subsequently, the G and R bands proved to have the greatest importance, which reinforced the idea of using the R/G ratio to represent the colour of the arils.
Since the average success rate of both methods (multiple thresholds on the R/G ratio and LDA on average values of objects) were similar (they differed by about 1% in each category), we decided to use the simplest one, which allowed us to increase processing time. Moreover, thresholds are easier to tune by the operators when they want to change the sorting results in real time.