mL DU 
101 
3. RESULTS 
3.1 Orientation with Calibration 
The results of Table 1 and Table 2 show that it is possible to measure the sit-to-standing movement for biomechanical 
analysis. 
  
  
  
  
  
Table 1. Exterior elements Table 2 Viideogrammetric mean square error 
left camera right camera principal point difference and lens distortion 
0.066 mm 
Xo -2.097 m 3.203 m 
Yo 1.052 m 0.970 m principal point difference 
Zo 2.981 m 3.081 m 0.067 mm 
® 0.073 0.044 
$ 0.663 -0.595 
0.008 0.011 
  
  
  
3.2 Biomechanical Analysis 
3.2.1 COG 
In the frontal plane, the fluctuation of COG is close to the normal-side of patients. Fig. 7 shows relationship of COG, 
normal-side and plegic-side knee of the serious hemiplegic patient , who cannot sit-to-stand from a chair without glasping 
both her hands. Fig. 8 shows that the ratio of the distance (p) of the plegic-side knee from COG versus the distance (n) 
normal-side knee. The fluctuation of a serious patient shows that the knee of the normal side is closer to COG. Also, it 
indicates the inclining of COG to the normal-side. 
——— moderate ---- serious 
ratio 
n/p 
  
  
  
  
1 2 sec 
Fig. 7 Distance of Knee Joint from COG Fig. 8 Ratio of Distance n versus p 
3.2.2 Moment of inertia 
In the sagital plane, the relationship among the position of the ankle joint, the position of the knee joint and is the 
position of the hip joint is given by the equation: 
tana — (Y, -Y)Z, - Z,)tanB « (, -Y)/(Z, -Z,) o 
0-a-p (11) 
IAPRS, Vol. 30, Part 5W1, ISPRS Intercommission Workshop “From Pixels to Sequences’, Zurich, March 22-24 1995