PROGRAM ORIENTATION NOTES

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A000100010070-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: November 1, 2012
• Sequence Number: 70
• Publication Date: October 12, 1966
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6
PROGRAM ORIENTATION NOTES
)9s(- 25X1
To perform a meaningful experiment it is necessary to obtain several types
of images (e.g., resolution target, binary image, continuous tone images) containing
the same aberration. Thus, for a given aberration, the related hologram filter and
inverse squared amplitude filter can be used to compensate for the aberration, and
the results from the different types of targets will allow a meaningful analysis. First,
let us choose for the impulse response a simple asymmetric shape that is reproducible
and yet easily analyzed. One possible response could be 'L' shaped or on arc of a
circle. Several images can be aberrated in exactly similar ways by simultaneously
photographing them as a group while the aberration is being introduced.
line of one possible experiment follows:
1. Place several images on an x, y mount as shown
An out-
2. During an exposure, have the x, y mount moved in two orthogonal
directions consecutively to effect an 'L' shaped smeared impulse
response.
,'r' 1/
/9ri sh
(Note: If the magnification of the camera is small then the x,y mount
can be moved by correspondingly larger distances and .any. undesired
motion errors introduced will have a smaller effect in the final
aberrated image.)
3. All (4) of the targets should have a reference point. Even though
only one separated impulse response is necessary to construct the
F. T. hologram filter and the inverse filter, it is advantageous to have
the impulse response recorded to enable a measure of how well each
imncrc is enrrP.etFr1 nftir filtnriniT_
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6
 Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6
4. Because of the scale changes in diffraction caused by changes in
the coherent radiation wavelength, it. will be necessary to perform
spatial filtering with a laser as a light source, or have the capability
to alter the focal lengths of the first transform lens. The spatial
filtering system is:
P = pinhole plane
O
Merv-24 L, J
Sw.aye .
V i
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L = collimating lens
L1 and L2 are the 1st and 2nd transform lenses respectively
O plane contains the aberrated.image
Iim (3') cIOb(X) S (y - x) dx
= Iob(Y) * S(y)
F plane contains the Fourier transform of the aberrated image
Iim(?) = Iob(')? TGA)
At the F plane we multiply (3) by
ikx (a) the hologram filter (1 + I T(?) 12 + T*(?) e ?? + T(?) e-1kx??
(b) the inverse amplitude filter 1/I T(?) 2
^-1 Iob (?) T (IA) 2 ikx?? -ikx
Iim I ,...12 + IT@)I +T*U`) e +T(?) e
(1)
(2)
(3)
(4)
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6
 Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6
or from the 3rd term
I ~ )(?) = Iob (?) e
ikx.
?
(5)
The I plane contains:
im z xo
I3 (z) = Iob . f z
(6)
which is the corrected image centered about the off -axis term determined by
ikv
e .
Note: In choosing imagery it is advantageous to have one military orientated scene
such as one containing tanks or the like, or an aerial scene of an industrial complex.
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010070-6