an [Et 
PE CA ES NEN SEES PATER 
  
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Up till now the SEIDEL series parameters for radial distortion 
8 
= 
have been computed to the limiting term ag (r - T 
{2} Pèlynomials in x and y: dx Ze, XT 
a iy 
Limitation in practical computation was set by a maximum 
i = k = 3, strongly correlated terms being omitted: 
en 7 lo So seo 0 = do? S0, 
generally omitting C15 = 34 = daa = ds, = 0. (. 
(3) Polynomials allowing e.g. for deviation from flattening and for 
film distortion 
z ik 
dn == (Ze; x x ) 
zz ik 
gy f= © Ze. X y) 
where i = k = 1 ... 3, omitting the terms 
Oo LL o Uno op 1 Cas 3 7 
The polynomials 1 to 3 may be accumulated as & whole or putting 
any two together as calibration parameters. 
The first mentioned compilation is well known (Brown 1974). Com- € 
bined polynomials have been computed for selected cases of (1) 
and (2) only. 
The terms given so far may be ascribed to certain physical pro- 
perties of the photogrammetric system and/or process. It must 
however be borne in mind that any parameter may cover quite 
different sources of deformation of the bundle of rays recon- 
structed. 
5,3 VARIATION OF CALIBRATION PROCEDURES 
(1) The program BOBUE is able to calibrate several cameras at the same 
run. Although there is a considerable increase in unknowns to be 
dealt with — which means above all increase in computer time - a 
test area with dense targeting and sparse control will gain more 
rigidity. 
  
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