Fig. 3
From: Parametric mapping of cellular morphology in plant tissue sections by gray level granulometry
Principle of granulometry. Principle of computation of granulometry curves using morphological closing. a Each image corresponds to the result of a morphological closing using increasing sizes of structuring elements. b Sum of gray levels in images after application of morphological closings. c Granulometric size distribution, corresponding to the derivative of the curve in (b). The dots on (b) and (c) curves correspond to the stages shown in (a)