we obtain a larger united model similar to the object. The geometrical 
characteristics of the modified self calibration method are illustrated 
in Figs.-6c and 6d. 
5.1.2 For functional constraints 
Functional constraints regarding the interior orientation of the system 
are introduced, based on an assumption that the interior stability of a 
non-metric camera is strong. In case of employing only two non-metric 
cameras for taking four overlapped photographs, they may be described in 
the form 
(i) for the first and second photographs 
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(ii) For the third and. fourth pictures 
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with four overlapped photographs for the general case. The constraints 
regarding the interior orientation are given in functional form. 
Fig.-7: The self calibration problem 
Because these 10 constraints have the same mathematical properties as those 
for Arrangement D of two metric and two non-metric photographs, the problem 
- 559 t