Figure 4.

Detection of maize leaves with IAP. Input images (e.g. fluorescence images) were at first subjected to segmentation. Two distinct methods were performed to detect maize leaves: (1) a skeleton-based method to detect the number of leaves; and (2) the SUSAN corner detection algorithm (Smith and Brady, 1997) to detect leaf tips (marked with circles) in maize plants. By applying a region-growing algorithm, variably sized parts of the leaf tips were extracted. Furthermore, the properties of leaf tips, such as their colors and orientations, were calculated (as highlighted in the inset box).