NINTH MONTHLY LETTER REPORT ON IMAGE EHHANCEMENT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A000100010009-4
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: November 1, 2012
• Sequence Number: 9
• Publication Date: June 14, 1967
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4
25X1
NINTH MONTHLY LETTER REPORT ON
IMAGE ENHANCEMENT (U)
(1 May 1967 to 31 May 1967)
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4
Although we expected delivery of twenty optical transmission masks nearly three
weeks ago, the precision and uniformity required in the masks was not fully appreciated
by the contractor. It was necessary for us to fabricate a new set of impulse responses
with slightly different dimensional scales to make the metal etching technique feasible.
We expect to begin work with these masks this week.
Alternative techniques have been investigated to simulate accurately an aberrated
impulse response but other contractors who have indicated they have the ability to
fabricate transmission masks with the desired characteristics all use essentially the
same basic photoetching process and admit our specifications are near state of the art.
In the interim we have continued experimentation with one dimensional smears.
In the seventh monthly progress letter we demonstrated the ability of an inverse-holo-
gram filter to recover a high quality line from a simulated smear of that line. These
results were obtained by using the novel single element filter which contained the
product of JT 1?) 2 and 1 + T (?) 12 where T (?) is the transfer function associated
with the impulse response of the motion aberrated image. In this reporting period
more conventional two element filters were constructed for comparison purposes. In
terms of resolution and energy transfer to the restored image the single element filter
technique is noticeably superior. In the absence of a careful comparison of two optimum
systems, a more quantitative statement would not be meaningful.
Although the experiments with the one dimensional slit have been very encouraging,
corrections of smeared photographs have been plagued with spotty illumination and a
high noise background. Much of these artifacts are caused by the coherent optical
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4
system but we are now completing an experimental evaluation of film types and exposures
to minimize sources of noise in the storage media. In the coming month we planto use
the data resulting from this study in the experiments to correct the effects of multi-
dimensional image motion using the specially fabricated transmission masks mentioned
above.
As of the week ending 3 Jun? 1967, 77% of the contract time has been utilized. Of
the amount funded 68% of the total cost has been expended. It is estimated that 75% of
the work effort is completed with the remainder of the contract being devoted to obtaining
demonstrable imagery and analysis of the approximations taken.
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010009-4