Michael Schlemmer Manuel Heringer Florian Morr Ingrid Hotz Martin Hering-Bertram Christoph Garth Wolfgang Kollmann Bernd Hamann Hans Hagen Moment Invariants for the Analysis of 2D Flow Fields. 1743-1750 2007 13 IEEE Trans. Vis. Comput. Graph. 6 http://doi.ieeecomputersociety.org/10.1109/TVCG.2007.70579 db/journals/tvcg/tvcg13.html#SchlemmerHMHHGKHH07