Such very descriptive data are not helpful when quantifying effects of a stress type or a range of stress factors, and responses of different genotypes. Classical methods such as biomass weighing give numerical data, of course, but they are laborious and destructive. In our example, investigators would not be able to do follow-up work with the plants, e.g. look for recovery.
In contrast, non-invasive digital measures allow standardising the measures by translating the phenotypic properties into numbers.
Image processing of the input images results in finding the plants and separating them from the background. In a second step, each plant is measured for dimensions, colours, and morphological factors. Data not only come in a digital way, but they also comprise values that are not accessible (e.g. morphological factors) when doing visual inspections only.