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In this paper, we propose a system for abnormal motion detection using 3D skeleton information, where the abnormal motion is not known a priori. To that end, we present a curve-based representation of a sequence, based on few joints of a 3D skeleton, and a deformation-based distance function. We further introduce a time-variation model that is specifically designed for assessing the quality of a motion; we refer to a distance function that is based on such a model as motion quality distance.doi:10.1109/ipta.2018.8608143 dblp:conf/ipta/BaptistaDAO18 fatcat:3hlq6ugk55d5xkkx32ttzyorxe