2-D Lower limb joint kinematics using a hybrid markerless approach applied to video camcorder acquisitions

A hybrid markerless technique is presented
and applied to estimate the 2-D lower limb joint
kinematics from acquisitions recorded using a video
camcorder. The proposed methodology is defined as
hybrid since it uses garments as “segmental markers”,
specifically high-cut underwear which contributes in
defining the pelvis segment and ankle socks for the
definition of the foot segment. The method was applied to
video sequences acquired with a video camcorder and was
validated by using a stereophotogrammetric markerbased
system. Results show that the proposed technique
can be considered as an easy-to-configure and affordable
alternative to marker-based photogrammetric systems.