In this paper a new approach to soft color image mathematical morphology, called
M. I. Vardavoulia, I. Andreadis, Ph. Tsalides, "Soft Morphology in the HSV Color Space: Definitions and Implementation" in Proc. IS&T CGIV 2002 First European Conf. on Colour in Graphics, Imaging, and Vision, 2002, pp 338 - 342, https://doi.org/10.2352/CGIV.2002.1.1.art00071