Hidden marker position estimation during sit-to-stand with walker.
Motion capture analysis of sit-to-stand task with assistive device is hard to achieve due to obstruction on reflective makers. Previously developed robotic system, Smart Mobile Walker, is used as an assistive device to perform motion capture analysis in sit-to-stand task. All lower limb markers except hip markers are invisible through whole session. The link-segment and regression method is applied to estimate the marker position during sit-to-stand. Applying a new method, the lost marker positions are restored and the biomechanical evaluation of the sit-to-stand movement with a Smart Mobile Walker could be carried out. The accuracy of the marker position estimation is verified with normal sit-to-stand data from more than 30 clinical trials. Moreover, further research on improving the link segment and regression method is addressed.
Convergence Laboratory, LG Electronics Inc., 221, Yanjae-Dong, Seoul 137-130, Korea. sangho7.yoon@lge.com
Sang Ho
SH
Yoon
Hong Gul
HG
Jun
Byung Ju
BJ
Dan
Byeong Rim
BR
Jo
Byung Hoon
BH
Min
D001696:Biomechanical Phenomena / Q000502:physiology; D057918:Fiducial Markers; D006801:Humans; D007596:Joints / Q000502:physiology; D009068:Movement / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012371:Robotics; D014853:Walkers