PROGRESS REPORT ON THE FEASIBILITY OF AN AUTOMATIC FOCUSING SYSTEM

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002600020002-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: May 25, 2011
• Sequence Number: 2
• Publication Date: May 13, 1965
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/05/25: CIA-RDP78BO4747AO02600020002-0
!'FIDEN"101AL
965
PROGRESS REPORT ON THE FEASIBILITY
ATIC FOCUSING SYSTEM
Summary of Work Performed.
A. A re-evaluation of the theoretical principles under-
lying the autofocus sensor showed that a modification of the
original scheme was required. This., however, does not adverse-
ly affect the overall program.
H. Solid state focus sensor panels were prepared and
tested. They were found suitable for proving the operating
principles.
C. An optical unit was designed, fabricated, aligned
and tested. It proved satisfactory for the project except for
its light gathering power.
II. Analysis of Work Performed,
A. Theoretical.
A re-evaluation of part of the theoret
cipies of a solid state autofoeusing sensor is presented to
show that a modification of the original auto correlation sen-
sor is necessary to produce a suitable autotacusing sensor.
However, the modification of the sensor does not significantly
change the total autofocusing system.
W 00m I "' E N 0010 1 AL
Sanitized Copy Approved for Release 2011/05/25: CIA-RDP78BO4747AO02600020002-0
 Sanitized Copy Approved for Release 2011/05/25: CIA-RDP78BO4747AO02600020002-0
F I DENT I AL
has been established that the total current I flowing
across the solid state correlator is given by
where L is the intensity distribution on the surface of the
correlator and T and S represent the displacement of the image
on the opposite face of the correlator, The valve of the inte-
gral is determined largely by the product appearing in the
numerator of the integral. Thus, it may be appreciated that
the total current is approximately proportional to the corrdfa-
tion function of the two displaced images given by
(2)
The following theorem was proved in the appendix of the
proposal: nThe peak value of the autocorrelation function for
a defocused image is less than the autocorrelation for the cor-
onding sharp image