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are viewed through a mirror stereoscope mounted 
in front of the monitor. After the orientation 
process the measurements are done with a cursor 
controlled floating mark. The already evaluated. 
image parts are marked in both images. by 
superimpositioning of vectors. 
4.2.4 Stereo System of "Fachhochschule 
Bochum” (FH BO) 
This system [HEIMES, PURUCKHERR 1990] is a 
development of the "Fachbereich 
Vermessungswesen, Fachhochschule Bochum" It 
falls under the categorie of object space 
plotters. The exterior orientation for a pair 
of. images is calculated using the bundle 
method. A 2D- and a 3D-graphic package enable 
the system to display the collected data on a 
monitor during the data acquisition process. A 
single photo rectification ist possible as 
well. 
4.2.5 FM1 
The FM1 is a  stereocomparator, which is 
especially designed for users of the multi 
images system ROLLEI MR2. It is mounted on a 
digitizing tablet and runs with the complete 
software of the MR2 system. Therefore it 
enables users of the above system to a 
stereoscopic evaluation of images. 
4.2.6 MPS 2 
The MPS 2 [UREN, THOMAS 1990] is somehow the 
software as the ASP 2000, so it differs from 
the latter only in terms of hardware design 
(size, accuracy, usable image size, see table 
4,2.1). 
4.2.7 PA 2000 
The PA 2000 has a built-in two-way illumination 
mechnism, which allows measurement of positive 
film and prints. The whole data acquisition 
program including the orientation sofware is 
controled by an external graphic tablet. During 
the evaluation of the model the digitized data 
is on-line visible on the graphic screen. 
Furthermore there are some graphic functions 
available, which can be selected on the 
digitizing tablet. 
4.2.8 STEREOBIT/20 
STEREOBIT/20 [CAMBURSANO, DEQUAL, ZONCA] is an 
image-space-plotter and equipped with two 
stepping motors for the parallax control. The 
model or ground coordinates can be visualized 
on a video display. An interactive graphic 
software enables the user to do a revision of 
the collected data and allows the plotting of 
evaluated models. An optional software module 
(8000 US $) gives the opportunity to compensate 
image deformations like film shrinkage and non- 
   
planarity of the film. 
4.2.9 Visopret 10/20 
  
  
  
  
  
  
  
  
  
  
  
low cost version of the ASP 2000, and it is The Visopret 10 and 20 are stereocomparators. 
portable as well. The system employs the same The Visopret is equiped with a 
Price Resol. image float. weight Interf. 
[1000 of meas. size mark [kg] to CAD 
US $] system [cm] [um] Systems 
[ um] 
Alpha 2000 60-70 1 23x23 5-50 230 yes 
ASP 2000 60-70 1 23x23 20 45 yes 
DVP 30-40 42 23x93 42 6 yes 
FH BO 40-50 5 23x23 100 120 yes 
FM1+MR2 15-20 25 24x24 100 15 yes 
MPS 2 30-40 4 7x7 25 20 yes 
PA 2000 50-60 5 24x24 90 100 yes 
STEREOBIT/20 30-40 10 23x23 100 45 yes 
Visopret 10 30-40 10 23x23 40 75 yes 
Visopret 20 20-30 10 23x23 40 55 yes 
  
  
  
  
  
  
  
  
Table 4.2.1 Systems with stereoscopic 
image measurment