PAR 116 DISTORTION IN PHOTO DUPLICATION

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002600070003-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: December 18, 2002
• Sequence Number: 3
• Publication Date: March 18, 1966
• Content Type: REPORT

Approved For Release 2003/01/28 : CIA-RDP78B04770A002600070003-5
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PAR 116
Distortion in Photo Duplication
18 March 1966
Declass Review by NIMA/DOD
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ST,AT
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PROJECT AUTHORIZATION REQUEST
PAR 116
18 Mar 66
SUBJECT: Distortion in Photo Duplication
TASK/PROBLEM
1. By the application of Moire' Techniques, study the effects
and the degree of distortion produced in the current film handling
systems during the duplication of photographic images.
INTRODUCTION
2. A limited study involving the use of Moire' Techniques
has been completed under another contract. The study was directed
toward the application of Moire' patterns as a tool to evaluate more
accurately the degree of distortion introduced during printing. A
vacuum frame and a continuous drum-type (Niagara) printer were used
for this study. No other phases of the reproduction system were
included in this effort. The results obtained. from this work indi-
cates a need to expand. the use of Moire' patterns as a method for
determining the image distortion introduced not only in printing but
during processing, cleaning, titling, and through a composite system.
DISCUSSION
3. It is realized that dimensional distortions occur when dupli-
cating photographic images. Although a distortionless system would.
be ideal, limited distortion can be tolerated if it is repeatable and
the degree is well known. A promising method of measuring distortion
is the application of Moire' techniques.
4+. Moire' pattern analysis has been used successfully to study
photographic distortions in the area of photogrammetry. In such
studies, flat bed contact printing of sheet film was of primary con-
cern, hence half-tone photographic glass plates could be used as orig-
inal negatives to which all subsequent duplicates were referenced for
analysis. Such methods, however, must be modified to include flexible
support master negatives for use on drum platen printers and other
roll handling equipment commonly found in aerial film laboratories.
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PAR 116
18 Mar 66
5. A half-tone screen made on Estar base film can serve as a
flexible support negative. A suitable negative can be prepared by
contact printing from a master glass plate. Thereafter, it can be
registered with the highly stable parent at any time to measure their
dimensional differences. Subsequent printings of the flexible master
can also be registered with the glass half-tone standard, hence a
measured distortion can be adjusted for differences between the glass
master and the flexible half-tone to yield a net distortion resulting
from the duplication system.
APPROACH
6. It is proposed. that tests be conducted using the Moire'
technique to study the distortion characteristics of the following
equipment items using 9.5-inch film:
a.
Trenton processor
Type 3404 film.
b.
Yardleigh processor -
Type 3404 film.
c.
Dalton processor
Type 8430 film.
d.
Niagara printer -
Type 3404/8430 film.
e.
Seneca printer
Type 3404/8430 film.
f.
Cleaner/Waxer
Type 3404 film.
g.
Titler
Type 3404 film.
h.
Composite system
Type 3404 film.
The above items will be evaluated
mental conditions.
under normal operating and environ-
7. The data computation required for analyzing Moire' measure-
ments is lengthy and repetitious and usually calls for statistical
analysis. Computer programs will be written to perform the calcu-
lations.
8. One method of presenting distortion data is the calculation
of average distortion components in the length and width directions of
the film. The results of these investigations will be presented in
this manner. In addition, other techniques will be sought as a means
of describing localized distortions and will be used where desirable.
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PAR 116
18 Mar 66
a Because distortion measurements are highly dependent upon
ambient temperature and humidity, it is proposed that measuring equip-
ment of the recording type be purchased to monitor the temperature
and humidity prevailing in the test area. Test materials can then
be conditioned in the room at known levels before distortion measurements
are made.
10. It is the intent of this PAR to develop techniques and study
the performance of the equipment items listed in paragraph 6 under
limited but typical production type operating conditions. Although
knowledge regarding the performance of each equipment item is valu-
able in itself, it is further intended that this investigation be
directed to items requiring future exhaustive study and optimization
of distortion characteristics.
PROGRAM OBJECTIVES
11. The objectives of this program are:
a. Develop techniques of using Moire' patterns to measure
distortion of roll film handling equipment.
b. Develop methods presenting distortion measurements both
overall averages and. localized values.
c. Study the equipment specifically mentioned in paragraph 6,
under limited but typical operating conditions.
SCHEDULE
12. A. tentative schedule covering major phases of effort is shown
in Figure 1. The time span indicated to complete the subject program
is based on actual start of work. Upon approval to proceed and/or
start of work,, schedule will be reviewed and necessary changes reported
as required.
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 ^ a ^ a al Ai Mi i A Anna a ^ i id
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Study Distortion in Photo Duplication
PAR 116
18 Mar 66
MONTHS
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1. Literature Review
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2. Equipment Design
and. Fabrication
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3. Computer Programmin
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4. Testing
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5. Analysis
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6. Reports:
a. Quarterly
b. Final
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