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On-line human action recognition based on patterns of RWE applied in dynamic windows of invariant moments

Abstract:

This paper presents a methodology for online human action recognition on video sequences. It addresses an efficient approach to use invariant moments as image descriptors, applied in processing silhouettes obtained from depth maps. A quick comparison between size-4 windows (equivalent to 4 frames) is performed by computing the Mahalanobis distance, on one of the invariant moment sequences identified as less sensitive to noise and more stable during movement absence. This approach is used for rapid detection of the idle/motion state, which allows the capture of dynamic growth intervals (windows) for further processing, rescuing from the signal contained their temporal and frequential properties. By applying the Haar wavelet transform, three decomposition levels are used for calculating RelativeWavelet Energy (RWE - RelativeWavelet Energy) and SSC (Slope Sign Change), obtaining 11-dimensional patterns. In experiments, 97% of 4 movements online-captured were recognized correctly, and 10 movements taken from Muhavi-MAS database were recognized with 94.2% efficiency. © 2014 CEA. Publicado por Elsevier España, S.L. Todos los derechos reservados.