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Fast and accurate human action recognition using RGB-D cameras

Abstract : The recent availability of RGB-D cameras has renewed the interest of researchers in the topic of human action recognition. More precisely, several action recognition methods have been proposed based on the novel modalities provided by these cameras, namely, depth maps and skeleton sequences. These approaches have been mainly evaluated in terms of recognition accuracy. This thesis aims to study the issue of fast action recognition from RGB-D cameras. It focuses on proposing an action recognition method realizing a trade-off between accuracy and latency for the purpose of applying it in real-time scenarios. As a first step, we propose a comparative study of recent RGB-D based action recognition methods using the two cited criteria: accuracy of recognition and rapidity of execution. Then, oriented by the conclusions stated thanks to this comparative study, we introduce a novel, fast and accurate human action descriptor called Kinematic Spline Curves (KSC).This latter is based on the cubic spline interpolation of kinematic values. Moreover, fast spatialand temporal normalization are proposed in order to overcome anthropometric variability, orientation variation and rate variability. The experiments carried out on four different benchmarks show the effectiveness of this approach in terms of execution time and accuracy. As a second step, another descriptor is introduced, called Hierarchical Kinematic Covariance(HKC). This latter is proposed in order to solve the issue of fast online action recognition. Since this descriptor does not belong to a Euclidean space, but is an element of the space of Symmetric Positive semi-definite (SPsD) matrices, we adapt kernel classification methods by the introduction of a novel distance called Modified Log-Euclidean, which is inspiredfrom Log-Euclidean distance. This extension allows us to use suitable classifiers to the feature space SPsD of matrices. The experiments prove the efficiency of our method, not only in terms of rapidity of calculation and accuracy, but also in terms of observational latency. These conclusions show that this approach combined with an action segmentation method could be appropriate to online recognition, and consequently, opens up new prospects for future works.
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Submitted on : Wednesday, December 13, 2017 - 11:07:30 AM
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Enjie Ghorbel. Fast and accurate human action recognition using RGB-D cameras. Human-Computer Interaction [cs.HC]. Normandie Université, 2017. English. ⟨NNT : 2017NORMR027⟩. ⟨tel-01662496⟩

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