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based upon a linear Monge-Kantorovich solution.

Reference
Pitie F and A. Kokaram. "The linear Mange-Kantovitch linear colour mapping for example-based colour transfer." In 4th IEE European Conference on Visual Media Production (CVMP07) London November 2007.

This is a C++/OpenCV implementation of the processing that was first presented as a Matlab implementation here.
https://github.com/frcs/colour-transfer.

It provides results which are comparable to, if not superior to, those provided by the 'Ruggedised Xiao' method.
(see https://github.com/TJCoding/Ruggedised-Image-Colour-Transfer)

Further information is provided here in the Documents folder.