4.2.1 Installation of object (point of measurement and 
control point) 
The object where 16 plastic sheets (15.6cm X 15.6cm size) 
assumed to be point of measurement and control point 
were attached was made and affixed at the elevator tower 
on the rooftop of the fourth pavilion of Chiba Institute of 
Technology which is shown in Figure 4. 
  
  
  
  
  
  
  
  
  
Fig.4 Object 
4.2.2 Photographing 
The experiment was carried out under the photography 
conditions shown in Figure B. 
The experiment was performed three times under the 
following conditions: 
Experiment 1: Taking a picture at a distance of 7m and 
base-height ratio 1/3.89 
Experiment 2: Taking a picture at a distance of 7m and 
base-height ratio 1/2.59 
Experiment 3: Taking a picture at a distance of 7m and 
base-height ratio 1/1.94 
Object 
  
4 
: +—»:Camera direction 
ZY : H:Taking a picture distance 
Fig.5 Photography condition 
As for movement and photography of camera, photograph 
is taken by moving tripod after determining the leg position 
of tripod in the front of a photographic subject in advance. 
In the experiment, shutter of a camera is pressed at point 
O first, and after operating the inertial device, the camera 
is moved from point O to point A and then, the shutter 
pressed again to take 1 set of stereo photograph. 
Furthermore, inertial camera has to be moved on to point 
O where measurement by the inertial device is finished. 
Moreover, the release is used to prevent the camera from 
vibration when taking a picture. 
260 
As for the synchronization of both taking data from the 
inertial device and taking a picture, method of inputting the 
electric signals at time of taking a picture was examined. 
However, since there is the passage of time in a certain 
period of time even though the electric signals was 
instantaneously input, synchronization of taking a picture 
and taking data was found difficult at this stage. Then, in 
this study, a photograph was taken by making movement 
of the camera stop at time of photographing. By doing this, 
signal output from the inertial device is the one under the 
condition of no motion of camera and through the signal it 
is confirmed of no motion in the camera. The position 
where the inertial device had stopped was decided by the 
data obtained while no movement was confirmed by eyes, 
and the data analyzed considering as the place where 
inertial device stopped and the position of taking a picture 
were the same. 
4.2.3 Decision of interior orientation element of 
camera 
Because of using a non-metric camera, the interior 
orientation element of camera is unknown. Then, the 
interior orientation element such as "coefficient of 
polynomial by which analytical film curved surface is 
given", “coefficient of function which gives lens warp”, 
“principal distance”, and “gap of principal point position of 
the camera” was required from 16 control points of the 
object. 
4.2.4 Decision of exterior orientation element of 
camera 
The position and the inclination of camera when taking a 
picture were calculated by using the accelerometer and 
the gyroscope. The position and the inclination of camera 
which were obtained from inertial device are shown in 
Table 1. 
Table 1. The position and the inclination of the camera 
  
4.2.5 Measurement and analysis of photographic 
coordinates 
The photographic analysis was measured with digitizer. 
The digitizer used was A2-50 made by the PHOTRON 
Company, and it's resolving power was 0.025mm. 
4.2.6 Analysis 
In this analysis the total 34 points were measured (set 18 
surveying pc 
attached on 
is enlarged i 
4.3 Result ¢ 
Photograph 
photographi 
station was 
value meast 
In the analy 
of camera v 
picture. The 
I 
Ou 1 
  
Next, the o 
obtained int 
inclination C 
inertia devic 
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was enlarg: 
coordinates 
points of mt 
of 34 points 
and they e 
experiment 
the error : 
direction of 
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mean. 
  
A part of tl 
based on 1