The threshold modulation AIM curve, for Kodak 2405 Double X. 
film is plotted on each MIF curve. 
The comparative data between the MIF system analysis for Gliatti 
and the lens analysis for Rosenbruch is shown in 22 graphs. While 
final conclusions must be drawn for each individual test (since 
line orientations differ, and there are other small variables), 
this practical study proves that MIF evaluation of aerial photography 
by edge gradients analysis will provide adequate criteria for sensor 
system performance and has no equal substitute when man-made targets 
of known deminsions and reflectance are lacking. 
6.3 OTF of Cartographic Cameras 
Martin80 of the Air Force Avionics Laboratory also contributed 
to the comparative MTF testing of the Ziess and Wild reseau cameras 
testing the lens in the camera. He employed an illuminated point 
Source, situated at the focal plane of a twenty foot collimator, 
the image formed by the camera lens being the point spread function 
of the lens. This image, which was relayed and magnified by a 
high quality microscope objective, was then scanned by a high quality 
knife edge. The resultant signal was detected by a photomultiplier 
and fed directly to a mini-computer for on-line, real-time data 
reduction, presentation, and analysis. Corrections were made for 
the off-axis signals. Results are as follows: 
Radial and tangential measurements were made on-axis and at 
10, 20, 30, 40 and 45 degrees for image planes extending from the 
reseau plate out to 100 microns beyond the plate. MIF curves are 
plotted for each angle and line orientation. Also plotted on these 
graphs, for the O degree to 30 degrees inclusive, are the MIF values 
measured by Rosenbruch, West Germany. 
The work described herein represents the first attempt by the 
U.S. Air Force to characterize aerial mapping cameras by MIF measure- 
ments; in particular, it is the first attempt at measuring MIF 
at such extreme angles as 40 and 45 degrees. The data looks reasonable, 
and compares favorably with that measured by others. Although agreement 
for some angles somewhat exceeds the criterion for "good agreement;" 
namely, + 0.05 units of MIF at non-axial positions, and +0.025 units 
on-axis, it is considered significant that the shapes of the curves 
at all field positions are consistent. 
6.4 Objective Photo Quality Measurement 
A study made for Rome Air Force Base by Attaya, Fenker, and 
Corbett of Itek was reported by Roberts9l of RADC. The primary 
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