GEMS VIEWER DESIGN:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000700010017-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: March 29, 2002
• Sequence Number: 17
• Content Type: HW

Approved For Release 2002/06/17 : C1A-RDP78B04747A000700010017-6
Declass Review by NIMA/DOD
Approved For Release 2002/06/17 :CIA-RDP78B04747A000700010017-6
 Approved For Release 2002/06/17 :CIA-RDP78B04747A000700010017-6
~~~~~~~ ~
SC~-JE Wa".? EonrTfii/RSi
CoNTE~ D~So7y
;,;~ ~3nr~i o~EN GA~~~
/ (~~ G A~~ `A?
~--_ ~
~ _-
AfF
h~rbar~
7
r'
Approved o'F r F~lease'2802/06/17 :CIA-RDP78B04747A000700010017-6
 Approved For Release 2002/06/17: CIA-RDP78B04747A000700010017-6
STATUS ON PSYCHOPHYSICAL STUDY
(Sub-task of Gems-Continuing Study)
Beginning with the acquisition of security clearances for
personnel, requirements of the Psychophisical study have
STATINTL
been examined by reviewing photographic imagery and related data at the
customer's facility and by conferring with
on two occasions. This review has lead to a recommended course of action
jointly agreed upon by
STATINTL
The purpose
of this status report is to describe the recommended course of action and
to request such comments and/or alterations as the customer may wish to
The recommendations made herein are concerned with the description
of the stimulus material (Gems) that should be prepared and the manner in
which they are to be used.
DESCRIPTION OF GEMS
.Ct is recommended that the Gems prepared from Psychophyaical
Study be tailored to the characteristics of the system.
These Gems will be ~-~~e~~ve transparencies having the following characteristics;
Scale Factor:
Film Type:
Processing:
/ ; 33Cm, rJoo
~~ ~5~0~
Cr5'S CA,I~l,N'G orC
Solar Elevation; ~f p?.... ~~'O
Angle of View: /~'? fr 1~.T> Pf{" ~~T -+- /?? PORT oh', STB~
.~'
j
TO 1/YCL /I3E ~. /yljLJS Ti;'//17L+ iQ/'~S.r'r/.FL.L~
Approved For Release 2002/06/17: CIA-RDP78B04747A000700010017-6
 Approved For Release 2002/06/17: CIA-RDP78B04747A000700010017-6
- 2 -
For each scene that is selected, a matrix will be constructed'
having the dimensions of Modulation Transfer Function. and. exposure. The
MTF axis will provide a progression in ground resolution from better than
nine feet to worse than 18 feet. The exposure axis will vary above
and below normal exposure in a manner that is to be determined empirically.
In determining the spacing along the exposure axis of these positive Gems,
we shall introduce a compensated printing of the negative Gems. This
compensated printing will in effect reduce the apparent changes in exposure
,just as is the practice in the processing of operational material.
SOURCE MATERIAL
In reviewing the available material f rorr which Gems may be gen-
erated, it has been decided that flight test photography from the
system would be the most appropriate material. The customers
cooperation in the selection of suitable images from this material is
requested.
MANNER OF USE
The first positive Gems prepared for this study shall consist in an
array described in Figure I. ]3y use of these Gems, equal increments of image
quality shall be established and thereafter a more complete Gems matrix will
be provided. This complete Gema matrix will be employed to determine the
feasibility of assessing the photographic image quality of an operational
system via comparative photography.
Approved For Release 2002/06/17: CIA-RDP78B04747A000700010017-6
 Approved For Release 2002/06/17 :CIA-RDP78B04747A000700010017-6
Nd~~?~L
,~XPr~s'r~t~~
~f~p`roved'Fo~ Release ~2~117~IA-R 7 047 00 001 ~~~ ~~ ~
-~i ~