IMAGE EDGE ENHANCEMENT VIEWER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003100010022-3
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: February 9, 2000
• Sequence Number: 22
• Publication Date: February 12, 1960
• Content Type: MEMO

\ppro a For Re se 000/05/10: CIA-RDP78B0 7A00310QQ 02--3
ce . emorandum ? UNITED STATES GOVERNMENT
STATINTL
SUBJECT: Image Edge Enhancement Viewer
0
DATE: 12 February 1960
Use of this viewer during the last 48 hours has established
the following:
a. The light source has insufficient intensity
for any transparencies with a density value greater
than 1.0. This value being an. exception rather than
a rule, it is virtually impossible to use current aerial
photography in the machine. It may be possible to
intensify the light by means of a condensing system
built into the illuminator.
b. Viewing at 1:1 the machine defeats its
purpose in that only the strongest edges already in
the photograph are enhanced. The low contrast imagery
which we want to enhance is filtered out.
This leaves two lines of approach-- either (a)
we make an enlargement in the order of 1OX of the low
contrast image requiring enhancement, or (b) the
magnification factor of the machine is increased so
that we can select the low-contrast image alone for
enhancement.
If we adopt (a) we are introducing a further
generation image with consequent losses. To avoid
losses, we would preferably enlarge into a fine glass
plate, but the immersion image holder will only take
film. It was found that minicard film was difficult to
insert in the holder.
c. One of the worst features is accessibility
for cleaning. The diffraction patterns set up by dust
tends to obliterate the image. The second pair of
lenses behind the filter wheels are extremely hard to
clean without virtually dismantling the machine.
Approved For Release 2000/05/10 : CIA-RDP78BO4747AO03100010022-3
 Approved For Release 2000/05/10 : CIA-RDP78BO47 7AO03100010022-3
d. The eyepiece is somewhat difficult to use,
making prolonged viewing a very tiring and difficult
proposition. Some form of binocular viewing would
be preferable to reduce operator fatigue.
Therefore, we suggest that some time in the near future
these points be discussed with Itek to see if the above?objections
can be overcome. STATINTL
Approved For Release 2000/05/10 : dIA-RDP78B04747A003100010022-3