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Nr EDU MEALS ION Asa ds RIRES EURO ERE ECCO DR DA GU REN SO et 
CAPTIONS TO FIGURES 
  
MTF curves of 21 NAg, f£f = 210 mm, F/4 objective for "white light": 
a) sagittal 
b) tangential 
Comparison of resolution of 21 NAg obtained by: 
  
classical methods 
o, X intersection of MTF and threshold contrast curve 
Integration of MTF curves with respect to spatial frequency 
. Quality criterion used to find the best image plane of an 
aerial survey lens 
Image quality criteria applied to some typical aerial 
survey objectives 
Image quality criteria obtained by integration of the MTF curves 
without subtracting tne threshold contrast curves for two objec- 
tives, namely: 
objective 1, 2 objective 2 
  
By contrast subtraction of the area below the threshold contrast 
curves leads to the quality numbers shown for: 
1 2 t 
objective 1, ---- objective 2 
  
Image quality criteria applied to study the influence of a 
gelatine filter on the image quality for two wide angle lenses: 
  
objective 1 without gelatine filters in front of the objective 
  
objective 1 with " " " " " " " 
2 
-——- Objective 2 without ' H yp n n " 
2t : ; : 
-——- Objective 2 with M " m " n" " 
Image of the same object taken successively with a WILD camera 
and two different objectives, flying height 1050 m: 
a) objective 1 , field angle 1592 w «259 
b) objective J , " i 359. Ww» «159 
c) objective 2 ; m | " 15% "12:259 
d) objective 2 , " " 350, Wp 2.59 
MTF curves corresponding to the images obtained in Pig.8. 
++++ objective 1, field angle 13%=w; =250 
A444 objective 1 , " " 3592 wo «59 
+++. Objective 2 , " " 159 wj «259 
-——- Objective 2 , " " 35% w2 «4159 
The threshold contrast curves for high (C=1) and low object 
contrast (C=0.23)are also depicted.