THIRD MONTHLY LETTER REPORT ON IMAGE ENHANCEMENT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A000100010013-9
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 9
• Document Creation Date: December 28, 2016
• Document Release Date: November 1, 2012
• Sequence Number: 13
• Publication Date: December 9, 1966
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9
THIRD MONTHLY LETTER REPORT ON IMAGE ENHANCEMENT (U)
(1 November 1966 to 30 November 1966)
Task Order No. 18
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 Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9
IMAGE ENHANCEMENT (U)
In the last monthly progress letter we indicated that the sensitometry with the
Recordak Microfile film was nearing completion. Although the work took slightly
more time than was initially anticipated, it is now substantially complete.
One of the principal reasons for choosing Recordak film, besides its high reso-
lution ( > 300 2/mm) and high speed (ASA 64), was the existence of a positive reversal
processing technique developed at this laboratory that caused no significant resolution
loss when compared to contact printing reversals that are usually necessary for con-
structing positive transparencies of holograms. In the past month we have succeeded
in adjusting the processing techniques to yield a specular gamma of ? 2 within 5%.
The procedure for obtaining sensitometric data of films to be used for hologram
or aberrated image recording is as follows. The film sample is exposed to a photo-
metrically measured intensity distribution of specified parameters. The specular
transmittance of the film sample is subsequently measured in the Fourier transform
system that is used for image restoration. Thus the sensitometric data is obtained
as a function of wavelength, coherence, and the specific system applications. Our
results indicate that there are no significant color and/or coherence effects detectable
on two identically processed films when one is exposed by red laser radiation and the
other is exposed by incoherent green light when both densities are measured with a
standard wide angle densitometer. However, when the density is measured with a
Fourier transform system, the gamma is approximately 15% higher than would be obtained
using the wide angle densitometer generally used for film sensitometry. Data from a
narrow angle densitometer (microdensitometer) falls midway between the other two sets
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-2-
of data. These results are graphically presented in Figures 1 a, b, c.
Work has also been applied to correcting motion aberrated images. A technique
has been devised to move a target at constant velocity while being photographed. Examples
of. a resolution target with and without a motion induced aberration are presented in
Figure 2. A resolution target was chosen for the first experiment to determine the
efficiency of the filtering operation. Work is now in progress to construct filters to
correct the aberrated resolution target and results of these experiments will be reported
next month. Continuous tone imagery will also be studied and the results obtained will
be compared to results from in-line spatial filtering.
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PROGRAM SCHEDULE FOR
"IMAGE RESTORATION"
A program schedule has been written for the mutual benefit of those involved
with this contract. The schedule is outlined in generalized categories as it is only
intended to give a view of the direction of the program and the scheduled progress
desired during the time of the program. The outline has been divided into two parts,
the first including the work that has been essentially completed to date, and the second
consisting of the planned direction and schedule through the remainder of the contract.
Because of the nature of a research contract it must be noted that the completion date of
any one program goal does not preclude continued effort related to that goal. For
instance, though the Fourier transform hologram system was basically completed at the
end of the first month, several improvements have since been incorporated. The
program schedule is as follows:
PART I
Fourier Transform Hologram System
System fabrication
System testing
Illumination
Resolution
Sensitometry
Film choice
Processing parameters (direct and reversal processing)
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 , Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9
Measurement of Specular Transmission on Fourier Transform System
(including coherence and wavelength parameters)
Relating Specular Measurements to Microdensitometer Measurements
and Macrodensitometer Measurements
Confirmation of Linearity
Coherent Spatial Filtering System
Lens Purchase and Set-up
Tentative Completion: 10 December 1966
PART II
Symmetric Aberration Restoration
Generation of Aberration (linear motion)
Filter Generation (hologram and inverse amplitude filter)
Testing and Analysis of Hologram Filter
Image Restoration
Analysis and Comparison to In-Line Inverse Filtered Results
Tentative Completion: 27 January 1967
Asymmetric Aberration Restoration I
Generation of Aberration (simple geometry., _e.,g. , . "L" shaped)
Filter Generation (hologram and inverse amplitude)
Testing and Analysis of Filter
Image Restoration
Analysis and Comparison with Theoretical Estimates
Tentative Completion: 14 April 1967
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 ti Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9
Asymmetric Aberration Restoration II
Generation of Random Aberration
Filter Generation
Image Restoration and Analysis
Obtaining Representative Data of Imagery
Tentative Completion: 21 July 1967
Comparison of filtered results with hologram filter alone (matched filtering)
and with combined hologram and inverse amplitude filteri:(,inverse filtering)
Comparison of above results will be made with those obtained from inverse
filters generated by a computer-photofacsimile system, tentative on progress
of the latter work for such a comparison.
Completion Date: 30 August 1967
Declassified in Part - Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9
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Declassified in Part -Sanitized Copy Approved for Release 2012/11/01: CIA-RDP79B00873A000100010013-9