550 
Bräuer-Burchardt, Voss 
However, we presented some remarkable amendments and additions to existing methods. We also discussed about the additional 
properties affecting metric reconstruction and presented a new technique to achieve correct rectification. Although exact metric 
measurements cannot be achieved using single images only, images with sufficient reconstruction accuracy can be obtained using the 
discussed methodology as depicted by some of the included examples. 
The most difficult issue in the reconstruction using single images is the estimation of errors and the determination of the measuring 
accuracy which attributes to the fact that image properties for historical photographs are different and also because of the depend 
ency of the reconstruction methodology on the properties of the imaged object itself. Although experiments using measurable objects 
were performed a main aspect of the future work should be to search for methods which improve reproducibility. 
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