rid 
tion 
rec- 
the 
the 
ne. 
imi- 
are 
  
  
the preliminarily known inner orientation. 
can be suitably selected according to the diagram 1. A 10-mm very 
nearly parallel and the grid is adjusted in the projector with the aid of 
The measured coordinates 
accurately measured grid is assumed to be used. 
The coordinates — projected or photographed — of points situated 
along the diagonals are measured in the projection plane for the deter- 
mination of the radial distortion. In addition 9 or 25 sy mmetrically lo- 
cated control-points are measured. 
l'ormulas for the determination, see diagram 2. 
r «nav? (2) 
n 
r (3) 
dr =" dz 
n h 0 
c y2 (4) 
dr = - 
n S h n 
R, = Yu vn Yon Y yn + Van SRE Xn rt Xn 2 Xn d: X in (5) 
where x, = x a (6) 
in measured given \ 
Yin = Y neasived V piven 
The weight-number 
c? (7) 
à. = 
rly . 9 
dr dr, 4 h? 
The standard error 
C 
m, = p+ (m = the standard error 
2 2h 
of the measurements) (8) 
  
  
  
  
  
  
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