DEAR DICK:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000700020012-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: April 1, 2002
• Sequence Number: 12
• Publication Date: February 3, 1967
• Content Type: LETTER

Approved For Release 2002/06/17 : CIA-RDP78BO4747A00070002001.2-0
February 3, 1967
Dear Dick:
The enclosed report briefly outlines the proposal work
on the System Parameters Study. The report defines the areas
that require co-ordination of efforts between the two facilities
and the materials desired.
If possible, I would like to visit with you on 15
February to discuss what might be done to obtain edge gradient
measurements and also to review the performance reports. It
is not necessary to have the required step tablets at that time,
but I would like to obtain these step tablets and corresponding
data by 20 February.
I'll be getting in touch with you shortly.
Thank you,
Declass Review by
NIMA/DOD
Approved For Release 2002/06/17 : CIA-RDP78BO4747A000700020012-0
 Approved For Release 2002/06/17 : CIA-RDP78BO4747A000700020012-0
SUMMARY OF SYSTEM PARAMETERS STUDY EFFORTS
General
The sole intent of this task is to establish an objective measure of the
photographic parameters and film properties associated with system performance.
These parameter and property measures, as listed below, will be used as a guide
to describe and specify the photographic quality to which to generate GEMS.
It is understood that some, if not most, of the parameters have been
measured in some manner and. that this data exist in report form. These reports
will be reviewed to obtain the pertinent information related to the task
objectives. Data, not available in report form or more appropriately defined
in terms of program equipment, will be obtained with the co-operation of the
customer.
Parameters to be Studied
The various system parameters and film properties to be defined aret
(1) Scene contrast
(2) System exposure range
(3) Film granularity
(4) Film density neutrality
(5) Tonal scale
T__._.(6) System modulation transfer function
The above parameters and properties are the items most significantly
influencing the visual appearance of the GEMS and the mission material.
Realistic simulations are only achieved by matching each system parameter and
film property.
Means of Obtaining Objective Measures
It will be necessary to acquire a minimum of four (4) step tablets which
have been processed under normal conditions. These step tablets will be used
to evaluate tonal scale, film density neutrality, and film granularity. The
step tablets should be accompanied by a sensitometer density step value listing.
In addition!to measuring the step tablets to obtain sensitometric data,
one step tablet shall be scanned on a spectrophotometer for a measure of
density neutrality; while a second step tablet shall be scanned on a micro-
densitometer to obtain granularity values at approximately 0.4, 0.9, 1.6, and
2.3 net density units. The above measurements shall be made onF_ _J STAT
facility equipment in order to avoid standardization of measurement techniques
between facilities.
Approved For Release 2002/06/17 CIA-RDP78BO4747A000700020012-0
 The reports also will be reviewed for information pertaining to measures
of resolution and image quality. If possible, a few good photographic edges
will be scanned on a microdensitometer to obtain a measure of the system's
modulation transfer function by means of the Edge Gradient Analysis Technique.
STAT
d r Rlease 0 (06 17 : IA-R P78S0&77AOJD~ip~1 12
Desired Materials
In order to perform the study described herein, it will be essential t
gather the materials defined below:
Approved For Release 2002/06/1 CIA-RDP78B04747A000700020012-0
The parameters of contrast, exposure, and resolution are to be defined
from existing report information. For the contrast and exposure parameters,
it is assumed that various frames of mission material have been scanned to
obtain density measurements and that these measurements are correlated with format
position. If the above assumption is true, a measure of scene contrast will
.be obtained by noting the maximum and minimum density values from specific
format locations. The system exposure range will be obtained by referring
the scene maximum and minimum density values to the ground exposure domain.
(1)
(2)
Four step tablets representative of normal processing
conditions along with a listing of sensitometer density
values that produced these step tablets.
Approximately five of the latest system performance reports,
containing the information desired, will be reviewed at the
customer's facility. The reports to be reviewed should be
those of a good or successful mission.
Approximately four high quality mission material frames with
suitable edges to be scanned. The frames are to be
accompanied by a sensitomgtric step tablet from the same
roll of film.
A visit shall be made to the customer's facility in the near future. The
purpose of this visit will be to review the performance reports; and to discuss
with the customer, possible means of obtaining the edge measurements desired,
zO X - /o o,
KA - 1410 Y.
STATINTL