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Figure 8. Tool bar of the feature extraction module 
7. SYSTEM CONFIGURATION 
STEREOVISOR has been developed in ANSI-C for Windows 
programming language. The system runs on Microsoft 
Windows 2000/XP operating systems. One of the most 
important conditions that we have imposed to this system is that 
can be run in a conventional personal computer and does not 
included non-standard hardware requirements. It uses the 
DirectX technology available in the Windows Me/NT/2000/XP 
operating systems that are common among the potential users of 
this type of systems. In order to reduce the hard-disk space 
storage requirements, the system uses compressed images 
(using the ECW format). 
The stereoscopic visualization system is based on an anaglyph 
vision that uses two different color filters (red and blue) for the 
images presentation. This solution allows showing the 
stereoscopic image with an adequate visual quality and 
practically do not need any hardware requirement (only 
anaglyph glasses). Another important advantage (fundamental 
for educational purposes) is that the stereoscopic model can be 
printed, projected (using a video projector for a large numbers 
of users) or used in laptop computers. The user can select the 
desired display resolution among the possible resolutions 
according to the capabilities of the corresponding graphics card. 
The basic customers of this product are the non-specialized 
photogrammetric users (Leberl, 1992). In this vein, the system 
has been designed for simplicity of use. The user interface 
follows the usual structure of the MS-Windows programs. The 
interface includes menus, tool bars, accelerator keys (hot-keys) 
and other usual elements of this platform. 
The basic requirements of the system are: 
- PC (Intel Pentium processor). 
- Microsoft Windows 2000/XP operating system. 
- Recommended RAM 128 Mb. 
- 8Mb memory Graphics card (minimum resolution 
1024 x 786, 24 bits color). 
8. CONCLUSIONS 
Actually, there are several digital photogrammetric systems that 
can be used for the 3D image interpretation which are focused 
on the cartography and DEM production. Usually, they require 
expensive hardware and specialized personal for its use. A 
software system for 3D visualization of the available 
information related with a photogrammetric project has been 
developed. 
This software does not have cumbersome hardware 
requirements and it has been designed thinking about the user's 
real needs. The information (features) can be collected from 
previously oriented photogrammetric images, registered images 
or orthoimages. 
The system includes all the main tools that are usually 
employed in data collection of punctual, lineal, polygonal and 
text entities. 
The main advantages of the system are: 
- based in a low-cost hardware using anaglyph vision 
system 
- flexible system that can be used by a large number of 
potential users 
- the photogrammetric information is available for the 
final user in a reduced time 
- itis possible to provide the oriented digital images for 
quality control of the photogrammetric process 
- itis possible to provide stereoscopic view to a large 
number of users using a video projector connected to a 
normal personal computer 
- uses intermediate products (like original images, 
orientation parameters, digital elevation models) that 
are normally unprofitable for the final user in the 
conventional digital photogrammetry work scheme 
- using this system, there is possible 3D visualization 
through Intranet or Internet 
- the end-user digital photogrammetry software licensing 
concept is changed to a project license concept 
REFERENCES 
Gômez-Molina, A. (1999). Flujo de trabajo en Fotogrametria Digital. 
Mapping, 53, pp. 53-62. 
Leberl,F.W. (1992). Design alternatives for Digital Photogrammetric 
Systems. 17th ISPRS Congr., Washington D.C., IAPRS, 29-B2, pp. 
384-389. 
ACKNOWLEDGEMENTS 
The STEREOVISOR Project has been technically approved and 
financial supported by grants of the R+D Spanish National 
Program, through the PROFIT Program of the Ministerio de 
Ciencia y Tecnologia and the Centro para el Desarrollo 
Tecnológico Industrial (CDTI). This project is also 
distinguished inside the EUREKA Program for international 
cooperation projects (Project responsible: Prof. Dr. Alfonso 
Gómez-Molina).