Fig. 3
Flowchart of image processing and calculation of the shape parameters of the outer bark. a Cross section of a bark piece. Black line indicates outer-bark edge. b Determination of outer-bark area (white shading). Measurement of outer-bark radial lengths and calculation of mean (OBT_avg), maximum (OBT_max), and minimum (OBT_min) thickness. c Cross section of a bark piece. d Determination of area of a bark piece (white shading). e Cutting of a piece (dashed line area in d), measurement of the outer-bark contour (OBC, black line), and calculation of the outer-bark surface roughness (ROBC). f Measurement of a convex envelope encompassing the total area of the outer-bark surface contour (ACOB), and calculation of the amount of outer-bark exfoliation (OBE). The scale length in a and c is 1.0Â mm