Opening by criterion, usually referred to as attribute opening (Breen & Jones, 1996; Serra, 1988; Walter, 2003; Salembier et al., 1998) is a class of more general connected filters (Salembier&Wilkinson, 2009). In binary context, this operation is a filter on the set of the connected components (CC) based on criterion calculated on CC. In this plugins, several criterion are proposed : surface area, length or tortuosity. Length and tortuosity are estimated using distance transform and extrema extraction (see Moreaud et al. 2011). If you use this plugin with length or tortuosity criterion, please cite M. Moreaud, N. Lamharess, S. Zinola, J. Lavy, Quantitative characterization of soot nanostructure from hrtem images, 13th International Conference of Stereology, 2011, Beijing, China.

References :
Breen, E.J. & Jones, R. (1996). Attribute openings, thinnings and granulometries. Comp Vis Image Understand 64, 377–389.
Moreaud, M., Lamharess, N., Zinola, S. & Lavy, J. (2011) Quantitative characterization of soot nanostructure from hrtem images, 13th International Conference of Stereology, Beijing, China.
Salembier, P., Oliveras, A. & Garrido, L. (1998). Anti-extensive connected operators for image and sequence processing. IEEE T Image Proc 7, 555–570.
Salembier, P. & Wilkinson, M.H.F. (2009). Connected operators: A review of region-based morphological image processing techniques. IEEE Signal Proc Mag 26~6!, 136–157.
Serra, J. (1988). Image Analysis and Mathematical Morphology, Vol. II. Theoretical Advances. London, UK: Academic Press.
Walter, T. (2003). Application de la morphologie mathématique au diagnostic de la rétinopathie diabétique à partir d’images couleur. Doctorate Thesis. Paris: Ecole des mines de Paris.

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