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of photos and 
metric camera 
observing the 
searcher drew 
  
This researcher could develop the  semi-metric 
camera, by extracting the coefficient of radial lens 
distortion, the principal point of symmetry, the principal 
point of autocollimation, the equivalent focal length, and 
the value of calibrated focal length, through the 
calibration about non-metric camera. 
At the time of photogrammetry of small size object, 
the result to have calculated by using the self-control 
point was satisfactory. So, this researcher could solve 
the difficult problems of control surveying such as the 
manufacture, installation and observation etc. of control 
point. 
If one changes the control point from 3 units to 15 
units, the proportional accuracy of X, Y and Z 
coordinates is improved largely. So, it can be seen that 
the number of control point is very important element for 
3-D coordinates measurement of object. 
If one changes the convergent angle from 20° to 
140° , the proportional accuracy of X, Y coordinates is 
satisfactory at 40' . And, according as the convergent 
angle increases, it is reduced gradually. But, the 
proportional accuracy of Z coordinates is improved 
remarkably in proportion to the size of convergent angle. 
So, it could be seen that the optimum convergent angle 
about 3-D coordinates of X, Y and Z is 807 — 120 . 
ACKNOWLEDGMENTS 
This paper was supported (in part) by NON 
DIRECTED RESEARCH FUND, Korea Research 
Foundation " 
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