International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, 
  
This gear system is used to rotate the camera in fixed minutes. 
Lower part is servomotor. Rotating time of the sensor can be 
changed several steps. Middle part is decelerate gear system. 
Rotating speed of servomotor is too fast for obtaining object 
images. Decelerate gear system can be slow down the rotating 
speed of servomotor. Top part is CCD line sensor. This CCD line 
sensor can get object images by 2048pixels x 80 line /minute. 
  
Figure 1. CCD Line Sensor System used in this study 
3. MEASURING METHOD OF THE 
DISTANCE 
This equipment is set at plural positions (for example, line 
sensor A, line sensor B, line sensor C and so on) on the identical 
circumference, and scenes of 360 degree circumferences are 
obtained, and the images are incorporated in personal computer. 
By putting the CCD line sensor on the mount, which rotates at 
the steady speed, and taking the images of 360 degrees. It would 
be able to easily realize the 3D measurement of the object. By 
counting the scene number of one line sensor (for example line 
sensor A), the angle from the direction of other camera (for 
example line sensor B) to the target marker can be calculated. 
Angle from the direction of line sensor A to the same target 
marker can be calculated by using the other line sensor B. As the 
result, distance from line sensor A to the target marker can be 
found out. The distances from cach line sensor to the markers 
are calculated by using the above method. 
  
  
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Line sensor A Line sensor B 
Figure 2. Obtaining method of target image 
Line sensor C 
= = 
Line sensor A Line sensor B 
Figure 3. Measuring method of the angles 
4. COMPARISON BETWEEN 
EXPERIMENTAL RESULT AND 
MEASURED DISTANCE 
The measurement was carried out using this system at Kanazawa 
Institute of Technology in Japan on 28 June 2000. CCD line 
sensor was set at 3 points near library center in campus. CCD 
line sensor was set at 3 points near library center in campus. Two 
kinds of focal length were selected. One is 135mm and another 
is 300mm. Rotating speed was about 12.6 minutes for 135mm 
focal length and about 28 minutes for 300mm focal length per 
360 degrees rotation respectively. We took 15 target points 
around campus. Number of pixels for each line are 2080. 
Sampling period is 21.39" for 135mm focal length and 9.62" for 
300mm focal length respectively. 
Number of lines can be calculated for 360 degree. 
Focal Length 135mm: 21.39" 
#Linc/360 = 360 x 60 x 60 / 21.39 = 60,589 lines 
Focal Length 300mm: 9.62” 
#Line/360 = 360 x 60 x 60 / 9.62 = 134,719 lines 
Calculated image sizes are as follows. 
Focal Length 135mm: 
2080 pixels x 60,589 lines 
Focal Length 300mm: 
2080 pixels x 134,719 lines 
Part BS. Istanbul 2004 
  
  
   
  
  
  
  
  
  
  
  
  
   
   
  
  
  
   
  
  
  
  
  
  
  
  
   
  
   
  
  
  
   
   
  
  
  
  
   
  
    
    
   
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