MULTI-IMAGE CAMERA CALIBRATION 
WITH A SMALL TESTFIELD 
USING TIE CONDITIONS: 
NUMERICAL STABILITY AND 
CORRELATION PROPERTIES *) 
by 
Bernhard Wrobel, Hannover 
Federal Republic of Germany 
1. INTRODUCTION 
In this presentation I am not going to speak about the broad 
field of statistical methods applicable in photogrammetry. 
I also do not want to talk about the even greater field of 
photogrammetric applications in industry. About these things 
we already have heard quite a lot in very nice contributions 
and it will continue this way in the following lectures, I am 
quite sure. What I should like to present is the task at the 
very beginning of those mentioned fields and which is one of 
the important prerequisites of photogrammetric work to be 
successfull: it is the job of camera calibration! This is the 
very old problem when dealing with metric cameras. 
Now, the problem of camera calibration of now-a-days - as I see 
it - is briefly speaking the following: 
On the one hand the increasing measuring accuracy and model 
refinements of numerical photogrammetry require high standards 
for camera calibration. Further on, the well known on-the-job- 
calibration, as has been demonstrated this morning, cannot 
  
+) The author has been asked by several colleagues for an 
English translation of the proceeding paper written in 
German language. Instead of this a paper will be given about 
the oral presentation held in Stockholm. It ineludes some 
additional computations about the numerical stability and 
correlation values. Reference will be made to the equations 
and figures of the proceeding paper. For explanation: 
Abb. is the same in German as fig. in English.