Fig. 7
From: Microscope image based fully automated stomata detection and pore measurement method for grapevines
Skeletonization and ellipse fitting process. a Original image. b Binary image. c Derivation of independent line segments via skeletonization. d Fit ellipse to the skeletal remnant representing the pore opening. e Binarize the region inside the ellipse and identify regions. f Pore boundary overlaid on the original image