text: Confusion matrices on KTH dataset.From left to right: s | Open-i
  pone.0130569.g016: Confusion matrices on KTH dataset.From left to right: s1, s2, s3 and s4.
  Mentions: Fig 16 represents the confusion matrices of the classification on the KTH dataset using our approach. The column of the confusion matrix represents the instances to be classified, while each row represents the corresponding classification results. The main confusion occurs between jogging and running in four different scenarios. It is a difficult challenge to distinguish the jogging and running because the two actions performed by some subjects are very similar.