Figure 8. Matching result of a motion model 
(lines = movement compared to next image) 
The calculations of the stereo models are still in progress. 
7. CONCLUSIONS 
Within the scope of the project WAVESCAN a groyne field at 
Norderney Island is recorded with four synchronised digital 
video cameras. For reconstruction of the sea surface a least 
squares matching algorithm is used. The obtained results show 
the high potential of the automatic measurement method. 
However, the approach has to be optimised in terms of level of 
automation, accuracy and speed. 
The treatment of more than two images has to be integrated into 
the matching procedure also. For this purpose the acquired 
image coordinates are transformed into object space using the 
interior and exterior orientation. Subsequently, the calculated 
object coordinates are re-transformed in the convergent images. 
Thus sufficient seed points are available for a new matching 
between the convergent and one of the normal case images. 
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ACKNOWLEDGEMENTS 
The authors are grateful to the Federal Ministry of Education 
and Research (BMBF) and the German Coastal Engineering 
Research Council (KFKI) for funding of WAVESCAN. 
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