Advanced material on object segmentation/splitting

I suggest to add links for active contours/level sets as Learn more either in the material about segmentation or in the workshop object splitting Possible links are:

• https://www.intechopen.com/books/medical-and-biological-image-analysis/active-contour-based-segmentation-techniques-for-medical-image-analysis
• https://en.wikipedia.org/wiki/Level-set_method
• https://imagej.net/Level_Sets