A revisit to human action recognition from depth sequences: Guided SVM-sampling for joint selection
Michel Antunes, Djamila Aouada, Björn Ottersten · 2016
This paper revisits the problem of human action recognition from skeleton joint locations, and analyses the tradeoff of sampling the joint space with respect to the recognition performance and computational complexity. The provided insights led to the design of a new algorithm for automatically selecting the most appropriate set of joints for each action. During the training stage, the approach applies a guided joint sampling strategy for learning different SVM classifiers, selecting the classifier that maximizes confidence and ambiguity metrics. Experimental results on three action datasets show that pre-selecting the most varying skeleton joints for each action dramatically reduces the computational complexity while keeping competitive recognition rates.