- 36 = 
But even for analytical plotters strictly only these will be * 
applicable which permit an affine deformation to the observer 
{or correlator). The only analytical plotters capable of doing 
so are of the automatic type using cathode ray tubes for 
scanning the image in a deformed manner. In particular these 
are the 'Unamace'" and possibly. the /'"Gestalt' — automatic 
orthoprinter. Nonautomatic analytical plotters of the 
AS-11-A type are suitable for evaluating sensor imagery only 
if the relative scale changes between two corresponding images 
do not exceed stereo viewing capability under the magnifica- 
tion used. The magnification and the viewing angle are ad- 
justable, while for standard instrumentation the magnifi- 
cation usually remains fixed. The possibilities, which sofar 
exist to plot scan or radar imagery with existing plotters 
are rather expensive. Nevertheless programs for evaluating 
radar images on analytical plotters exist [35]. 
Another possibility seems more accessible. Any plotter which ® 
possesses a digitizing arrangement for continuous lines 
(Planimat with Ecomat ll, Wild equipment with EK 8 or even 
a D-mac digitizer, for example) may be used to delineate 
interpreted information on radar images. An appropriate 
computer program may generate graphical output for an auto- 
matic plotter. Such an approach was demonstrated by Bosman, 
Clerici, Eckhart and Kubik [25]. 
A different solution is the production of a rectified image. 
  
While radar imagery may already be presented in ground 
distance representation, infrared scanner and sonar imagery 
has large systematic display distortions, which can be re- 
moved very simply by suitable differential rectification 
with optícal - mechanical or electro - optical devices. 
These may either be mechanically driven or under the control 
of a computer. À suitable differential rectifier for this 
; ; p 
purpose is the O.M.I. - OP/C orthoprinter in conjunction + 
with an analytical plotter (the AP/C). IC may be driven 
automatically for this purpose. Suggestions for the con- 
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