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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Int J Comput Vis. 2012 Sep 12;101(2):254–269. doi: 10.1007/s11263-012-0566-z

Fig. 5.

Fig. 5

For the LOT distance we replace the full f-image and the g-image of the particle at zk by their centers of mass x̂k and ŷk, (7). When there are many particles the images of particle at zk tend to be concentrated on a few nearby particles. Thus the error introduced by replacing them by their center of mass is small.