Anai, Tetsuji 
It is reasonable to take into account the movement of some walking elements for gait analysis. Therefore, let 
assume that gait analysis is performed using walking elements, in this paper. 
For this goal, firstly the authors developed a function for automated detection of walking elements from 3D 
coordinates of human feature points, and the length of stride and walking cycle are obtained from this function. 
Secondly, in order to easy understand of human walking cycle, skeleton images for critical elements such as heel 
strike, foot flat, mid stance, heel off, toe off and mid swing are displayed on PC monitor. Figure 5 shows the 
skeleton image for critical elements and stride length of subject. Here, let express the walking elements by sign, 
such as heel strike (A), foot flat (B), mid stance (C), heel off (D), toe off (E), and mid swing (F). Period A and E 
show acceleration, and E and A show deceleration. 
AB C DEF AB C DEF AB C DEF AB CDEF ABC DEF ABCDE FAB 
  
  
  
  
  
  
  
Acce 
di »|«— > | |< > |< 
1.164 m 1.297 m 1.049 m 1121 m 1.018m 1.062m 
(a) Left Leg 
DE FABC  DEFABC DE F ABC DEFABC “DE F'ABC "DET ABC 
= SC 
> |< 
1.308 m 1.116 m 0.993 m The ef 
(b) Right Leg analysi 
perforn 
Figure 5. Skeleton Model and Stride Length stereo 1 
coordir 
It may be seen from Figure 5 that, one 
1. The average value of stride length for the left leg was 1.118m. s T 
2. The average value of stride length for the right leg was 1.137m. i i 
3.The maximum horizontal displacement of the head was found between mid swing (F) and heel strike (A) in wns 
Figure 5(a). However, the maximum horizontal displacement of the head was found between mid stance (C) 
and heel off (D) in Figure 5(b). REFER] 
Consequently, it is concluded from the result that the main horizontal locomotion was performed during the 
swing phase of the left leg. Anai T. 
Motion 
Figure 6 shows the walking cycle and Figure 7 shows the acceleration of the head in Z direction 
It may be seen from these figure that, Anai T. 
1. The average value of one walking cycle was 1.26 seconds for both legs. Video T 
2. Stance and swing phase for the left leg are analyzed as 0.80 and 0.46 seconds respectively. 
3. Stance and swing phase for the right leg are analyzed as 0.69 and 0.56 seconds respectively. Chikats 
4. Large acceleration can be found in the left leg, and the peak positions coincide with toe off. Archive 
It is evaluated from these results that the deference of walking cycle and acceleration between the left and right Chikatsı 
leg were occurred by the influence of the braces. IAPRS, 
Chikatst 
for 3D N 
  
28 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.