ti 

STUDY PL A7. 

Ref. inernts in Arpli:ntins 

, r . 

o:e..Ther 

PREI-AR 

NRO APPROVED FOR RELEASE 

22 June 2015 

his 1Thcament Contain:: 4 

Paes 

• 

PAR 

APPRTE1' BY: 

Teen 

Contract EB-1492 

r 

114 
NRO APPROVED. FOR RELEA 

22 'June 2015 11. 

PAR 25-6-2' 

1 I 1:7- 55 

a 

'StlEkTEcT:Study •P an 

TASK/PRCELEM 

.a. •method:3 iffprorj.ng the avplicabllity of the mi,-.:ridensi,r: 

• • .4 

teel'Infc.)ues Procedure::: as applied in the evaluat_-) 

c\3 rez:c2-.r.aissance.rna'..erials.„ Studies to,..;:inc.r24e a Proposed •r;:athe...:-.at .1fsall 

dt.'tcrmine if hit.n., rata 'an 'be 

e n o., the 

tcfr proira_rn' (SWRDT-c)._or 

1,re:cation. 

riTRODUCT T 

71‘.e2. 

a t. . 

ra ;;E:1,1.7, a_nd t 

--.1-1er,:v -ay. 

•_.rrent needs. A ar. 

renori.7 ( see F.- feren..2e I) indi - a terli 

fo- ty en:"_ -serdn a_.'1 

te'Lhnique rpret.ers, • nr7 _ (PATH 

' ,00nce rned l ' a. o r towar: re. 

P. The c_irrent need 

tra 7L at 

-,12nnrc-vin;7. the a caracY, precision, and c:_-)nvcr. coca' -2if the T 

neral. cxperioent 2onduc.ted in 'an 

rrnatf.:2n_ on all three. cha_racterio.t::f:7. 

t-nics rlan ed for PAR 25-'6-2 are listed below. The 

1 

neceszarliy that which will be fillowed since Para-UPI fpv€F,tii,ati7nr, --

it several 47-opi,cs will be conducted sirr.ultaneously whE-re 

1 
• 

NROAPPROVEDFORRELEASE lip 

22June2015 . 

1 Nov 65 

DATA CODLECTION 

.The first stage in compating mission quality from edges is 

that.. of sunning the eJge in a ticrcienSitometer. As may be expectej,, 

any, errors in the. flatNor metho3.at this stage can betcompounjed in 

rater data prccessin.g, therefore the accatacy and precision cf 

edge tracing .appears t befundamentallY limited by this first 4erA.pic o , 

b. There are two Iliord3:ensitometers engage.: i. M hii sioa edge 

the M:ann instr=-ant. .and'ke 

A

Kpd6,:.Model A c-Jt . -Plrisbn will., be mae , 

• 

tbece instr_ments,^to 1-1.cw their res,,lation, edge .seri-:ea 

2'2wersrectra and stray light control (see Reference 2).' C_iS ate, 

it he possible ns.te any ,systematic 

. lance edge trscing.. ..,..,-.. 

-he 'Crcsso.er" e;:'e':rLse (see Reference :cnsiste:: 

ensitc..eter•cO:nparisen test-inwhi"^h.:'a seri.es f:''sec lat_rat,ry 

.-- ■ 4. 

) _ ,.....,..,.,- 

-.•arylng in ::121 - .A.P'prress-were circalet- tel!eEtei: rarticipan.ts 

- • 

for scannino in se-.era_ mi-croiensicreters. -- a.retetittcn 

. . ,-.., 

”Croc,scer" e:e,:c.se-is initiated, this .facility aril.:',1..p-erat . t.le 

edge scanning and data red:tion. 

In croces.,-=ic. oisy•sgna_s, it is-pocs _e ...o, ef°7-elLy c,.....n:ancy ... 

to in:rease the L-to-noise ratio; a.:isam' _ha the n.,:ise is rancn.. 

Preliminary testihg: naltiple scans a ran.oi p=sitio:Is along .the 

length' of an edge has shown that. impro:vement in the preciS',on of edge 

tracin:, is approimately rroportiosal. to the! sc -

.- . 

iaare root of the namben 

of tracin,L-.s of each edge. This stady •will be extended tc inclade the 

following topics; • 

(I) Best method cf signal averaging. .., 

(2) Definition:o.f. the number of tracings req-aired to .7,i.- e apractical level. of:lorecision. 

• - , • . 

(0) Methods for speeding the .accamalation cf - taltiple scans-:- 

. „ 

4 .t.. 

,.. 

"ferenceS that w 

• 
NRO 4\-RPROVED-FOR RELEASE 

22 June-2t5" 

-FAR!-T-L6-L2 

l Nov 65 

e. The micrc‘denSitometer. illumination optics ahg 'slit determine the. 

••.i.ec.ree of coherence present, in ed.J.e .scanning. coherence 

(ecreasin.,r sit size) the, modulation transfer ter.:hnique hecomc.S unusable 

2sti7atr resolution. An attempt will 

,be 

mate t evaluat 

effect of ::.qheren..e ,pn edres in c..Irrentjr.iSZiOR anf1 ablish, 

-"• for tltis 

DATA RlaUCTION 

a. The. data oltafned In scannin:- treatment 

ccth Cl nci:Te flu-t'_lations, and then iE to. 

iata powr). sm:ootni 

n h2VE "teen 'c.17es 

the ac,:racy and reed L:71. 

. ar.z. 

The ..eshni2ue emfloveri'al. 

of faf!r:2,- .- th.:, analog tra.e . of 

comnef sm.00thi. poly=fs.li- . avt,, ra - - a 

Oka ea -e. least 

• 

no teentisf-tory in ll test -a.SeE. 17,7t: 

c- t

smOoth, howevr. are scab thFt 

aban:.th the Parch. To be inveStigated are;' 

Multiple- te:hniqus combinin several type_cf ombuter 

smoor.hinz- in serial rates of the data . 

(2) Cress correlation methods in which a nbwled:-.z:ci the 

,:.hare is used,. 

c. The trace data ii^.ow. reduced.•in the PonTuter by means 

Fourier transform techniquesaiie this method appears to b'e satisfactory, 

other methods have been proposed. Examples of these are.she Hcrmite 

fhnctions, Fredholm integrals (see Reference 3), and non. linear regression 

techniques (see Reference 4). Studies will ce made of these methods with 

the intention of comparing their :merits With the standard Fourier metbod.. 

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• are * 

3 ir. 

( H.a:e = 

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NRO A^‘PPROVE _FOR RELEASE 

22 June 2015 

c. • 

SPECIAL TOPICS 

a. 3- 'special ire ir..erest- in thJeta need investi:7ation. St.Idy -is ria=ed •Is,r the 

Frra da..a if - - njw re 

• 

' M c 

.:'ffer +A- fa:T7:c=r 

_re_°C`:n:tene "sharDrle: 

- "..arcs:. Ar.2:her 

:nread This la:te2- 

f.-.7a-ma -,- i.-r thar, is :. or.tained in '_a 2'n,71:- wiitl: n'zr.tef. - 7:,,:. :.- ,t'- _ 

te stie:', fc-r gdal:.'ly - .2crres=dencse 'with area fact= Gr.-7. 7.'n'rren 

inane w'ah oontPin'n of the '.c 1 enere7y) str.d :ha_-. , factors (e... 

skeimess and ',:drt17sis, 

• 

T re 

a‘ 
.NRO APPROVED FOR RELEASE 

22 June 2015 

References 

. , . . . . 

•1. R. E. Swim:, and J. V. Gaven, Report on thy, Image Quality E0_1uation 

Program; July 1965 . 

2 Performance etimparison.Test Plan for Mann-Data Microdehsitometer ... 

- Versus Kodak Model 5 Densitometev, Contract EB*1492, 20. October 1'Q65.. 

3. R. Barakat, "Determination of the Optical Transfer Function D]reetly . ' 

' . from the Edge Spread,Function",.. J. Opt., Sco.- Am., 55, October 1.-)05, 

DTI. 121 7-1221 .. 

)4. J. Y. Th!-,onds, "Analysis of No-nlinear PhOto7raphic Gytemi;"-. 

Photo. - :".:ience Eng., 9,. September7Gctoter 1 -405•.. pp. 72A4-330.