On all accounts a digital stereophotogrammetric system is more flexible and
more powerful than common instruments. À system designed for photogrammetric
purposes will be capable to perform all functions of analog instruments such
as rectifiers, comparators, stereoplotters, dodging instruments or orthopro-
jectors. This means that a digital stereophotogrammetric system as a unique
tool could be used for universal tasks and will overcome the needs for a
variety of instruments necessary today. :
6. Conclusion
It is obvious that a completely digital stereophotogrammetric system offers
a variety of advantages and leads to a new generation of photogrammetric in-
strumentation.
At the Technical University of Berlin an experimental system for stereo-
photogrammetric purposes is under development. The aim of the authors is to
get experience in realization of the digital concept by using a commercially
available image processing system. The main hardware components at the De-
partment for Photogrammetry and Cartography are an image processing system
IP6432 of DeANZA Systems Inc., a VAX 11/730 of DIGITAL EQUIPMENT Corp. as
host computer and for graphical output a computer-controlled drawing table
KERN GP 1.
At present a software package for stereophotogrammetric needs is being de-
veloped. First investigations are made for the solution of the paging con-
cept for image roaming, for the implementation of stereo-correlation algo-
rithms and for realization of relative and absolute orientation.
7. References
(1) ALBERTZ, J.: Digitale Komponenten in photogrammetrischen Systemen.
Schriftenreihe Institut für Photogrammetrie und Kartographie,
Technische Hochschule Darmstadt, Nr.3, 1984.
(2) CASE, J.: The Digital Stereo Comparator/Compiler (DSCC). Paper Sym-
posium ISPRS-Commission II, Ottawa 1982.
(3) HELAVA, U.V.: New Principle for Photogrammetric Plotters. Photogramm-
metria 14 (1957/58) pp.89-96.
(4) PETRIE, G.: The Philosophy of Digital and Analytical Photogrammetric
Systems. Paper Photogrammetric Week, Stuttgart 1983.
(5) SARJAKOSKI, T.: Concept of a Completely Digital Stereoplotter. Photo-
grammetric Journal of Finland, Vol.83, No.2 (1981) pp.95-100.
