Figure 2.

Quasi-periodic signals produced by the five ratio-based body measurements estimated from image sequences from one individual walking at three different speeds included in (a) OU-ISIR dataset A and (b) CASIA dataset C. Here, HW1—ratio of the full-body height to the full-body width; HW2—ratio of the full-body height to the mid-body width; HW3—ratio of the full-body height to the lower-body width; A1—ratio of the apparent to the full-body area; A2—ratio between area between legs and full-body area.