Representation for Action Recognition Using Trajectory-Based Low-Level Local Feature and Mid-Level Motion Feature

Figure 1

A comparison of the iDT trajectories and -flow dense trajectories. The red dot is the end point of the green optical flow vector in the current frame. (a) The optical flow vectors are tracked by the improve dense trajectories using SURF descriptors matching [12]. (b) Most of flow vectors due to camera motion are removed by -flow method.

(a) iDT vectors

(b) -flow DT vectors