Fig. 7.

Steps of detecting leaf structure. a The result of a 2D skeletonisation approach to extract leaf structure. b Detect end points of the leaf structure that correlate with leaf tips. c Large or long rosette leaves identified if they are between 50 and 70% of the final size. d Generate a leaf outline series to represent the distance between the plant centroid and its leaf contour, at angles between 0 and 359 degrees with a 15-degree interval. e, f The number of detected peaks are used to represent the number of leaf tips