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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.