Full text: Reprints of papers (Part 4a)

ler x. und 
raphisch duy 
x Parallax X 
rgestellt, 
) m. am Raj 
0,20 m am la 
1 ersehen, vi. 
lung nicht gan 
influssen, -— 
henden St: 
hne weitem 4 
sie wurden ı 
berücksichtit 
MeBebene 
eine y-Par 
nd und daher 
tt. Das entsp 
  
  
Aufriß 
[^m 
— — 
Grundlinie 
  
  
  
  
  
  
Grundriß 
  
  
  
  
  
  
  
Abb. 3. Die Doppelprojektion, dargestellt im Aufriß 
und Grundriß. Der Punkt Pist frei von y-Parallaxen, 
der Punkt Q zeigt y-Parallaxen 
der Meßebene und dem Punkt Q". Die y-Parallaxe finden wir dann im Grundriß als 
ke 0,0% = p,. Die wahrscheinlichste Lage für den zu bestimmenden Punkt finden wir 
er Annahme d y — 1/2 (dy, + dy). Die MeBmarke ist also auf die Mitte der Strecke 
Ihe increasing requirements of accuracy in photogrammetry have made the lens distortion 
problem of first order. Certainly, the distortion may be neutralized by means of optical 
ensations — Porro-Koppe principle, so-called compensating plates and similar means — 
ere will always remain adjustments depending upon imperfection of the compensating 
od. These adjustments demand special consideration. 
mathematical treatment of the problem indicates that the influence of the lens distortion 
1 the stereo-measurement is completely dependent upon the type of the lens distortion 
The maximum values, in general the only data offered in the description of an photo- 
Metric camera, are important, of course, but also the shape of the distortion curve. Thus, 
0 separate objectives marred by approximately the same maximum lens distortion the 
H 
| 
r1 
> - 1 
MM: 
i 
  
  
  
  
 
	        
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