investigations. 
Further research should be performed to derive a 
proper theory for dealing with general geometric 
features. This includes the extraction of features in 
image space, the matching of corresponding features 
in multiple images and image orientation and object 
reconstruction in 3D space. The functional and the 
stochastic model for the rigorous treatment of these 
features should be developed including precision and 
reliability aspects on all levels of processing. This 
means that the uncertainty of the original observa- 
tions as well as the precision and sensitivity of the 
intermediate results should be modelled and propa- 
gated through the whole evaluation process. 
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