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I it will lead to the unification which is a most 
desirable feature and also it will lead to simpli- 
    
can supply the needs of many customers eco- 
nomically. This naturally leads to the setting 
up of data reduction centres where machine de- 
velopment can proceed in response to the needs 
of actual work. The combination of production 
with machine design may even lead to the dis- 
appearance of the present division of the in- 
dustry into manufacturers and users. 
The enormous volume of image data soon 
to be available from lunar and planetary photo- 
graphy would make great demands on the re- 
duction centres, which could become even more 
automatic and self-sufficient. 
The library problem accompanying the 
storage of ever larger volumes of information is 
already acute, and techniques for data storage 
and retrieval are currently receiving much at- 
tention. Methods for handling graphic data are 
not as advanced as the methods for symbolic 
data, therefore the library problem arising out 
of this abundance of imagery will no doubt be 
a monstrous one. Perhaps the peculiar scanning 
and sensing methods of Stereomat will assist in 
this area also, thereby taming to some extent, 
the monster it has helped create. 
References 
1 Hobrough, G.L. "Automatic Stereo Plotting”, 
Photogrammetric Engineering Volume XXV 763 
(1959) 
2 Esten, Randall, D., "Automatic Contouring”, 
Photogrammetric Engineering Volume XXIII 49 
(1957) 
3 Blackut, T.]., and Helava, U.V., "Automatic 
Stereoplotting in Small and Large Scale Mapping”, 
Report to the IXth International Congress of 
Photogrammetry London 1960 from National 
Council of Canada. 
4 Helava, U.V., "Analytical Plotter in Pboto- 
grammetric Production Line”, Photogrammetric 
Engineering Volume XXIV 794 (1958) 
AUTOMATIC STEREO 
Appendix 
The structure of the functional units of 
Figure 4 and 5 are detailed under separate head- 
ings. 
The operation of the correlation circuits 
is described in terms of their response to the 
transient signals from image boundaries. 
Scanning Generator — Figure 7 
  
Separate X and Y noise generators give 
independent motions to the scanning spot in the 
X and Y directions. The quadrature network pro- 
vides two periodic signals having a phase differ- 
ence of 90 degrees. These signals are added to 
the random noise signals to give a low-velocity 
circular motion to the scanning spot. The cir- 
cular motion is small, relative to the random 
motion, and does not change the character of 
the pattern appreciably. The purpose of the cir- 
cular scan component is described later in con- 
nection with terrain slope sensing. The gain 
control units vary the size of the scanning pattern 
in response to the T.S.M. signal from the corre- 
lation unit. 
4004 QUAD 
NET. 
F 
[hosel 8 Bano] D [can | POWER] X, 
NOISE > ( GAIN POWER| 
| PASS + [— 59——9O DEFLECTION 
L SEN. NET. = CONT. | AMP | DEFECT 
CONTROL 
SIGNAL IN 
(TSM) 
WAVEFORM AT E —/ NON REN 
WAVEFORM AT F————— —; x Pf VY. 
Figure 7. Scanning Generator 
oi A [8m] C r — ; 
NOISE PASS .—»—(*) GAIN POWER > 
jus NET | T CONT pers eS DEFLECTION 
fe 
    
TYPICAL WAVEFORM AT A OR B 
TYPICAL WAVEFORM AT COR D 
  
Correlation Unit — Figure 8 
  
Signals from the photo-cells are processed 
by: 
1. A multiplying correlator to give a tracing 
velocity signal. 
2. A registration discriminator to give aregis- 
tration error signal. 
The registration error signal is processed by 
the parallax analyzer to give coherent X and Y 
parallax signals. 
A portion of the X parallax signal is pro- 
cessed in the slope analyzer to give two signals: 
root, unaer CridirrransTip oy vir rrerava,purne 
adequate record of the discussion is available 
for publication. 
  
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