CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
sherds with handles and sherds with a large curvature with
respect to box 1 and box 2. Experiments have shown that
the extraction of the profile line could be done on 5 out of
26 sherds of box 3. Figure 11 shows a sherd containing a
handle, where the estimated rotational axis is incorrect.
Figure 11: Piece 8 from box 3 registered using an incorrect
estimated rotational axis. The dark gray part is the outer
view containing the handle. The light gray part is the inner
view of the sherd.
5 CONCLUSION AND OUTLOOK
We have proposed an automated system for extraction of
the profile line, which was required for archaeological clas
sification and reconstruction. The work is part of a docu
mentation system for ceramics. The acquired 3D-views
have been registered and oriented using the rotational axis.
Afterwards the profile line was extracted by intersecting
planes from the registered and orientated 3D-views of the
sherd. The method has been tested on real data with rea
sonable good results. Also sherds that can not be processed
manually, because of their low curvature, can be processed
by the presented system.
Future work will go towards making the existing system
more robust with respect to the sherds with handles and
bottom fragments, so that the registration can be applied
on a larger percentage of sherds. The presented system
is able to determine, when the estimation of the rotational
axis fails, but it can not detected the reason (e.g. handle)
for that. So a detection and separate processing of sherd
with handles or bottom-pieces would increase the perfor
mance of the system.
As the rotational axis leads to the position of the fragment
in the unbroken vessel multiple fragments will be matched
to reconstruct the whole object. Figure 12 shows a whole
object, which was reconstructed manually by archaeolo
gists. This could be done by matching the profile lines
from different sherds of one object, so that the whole ob
ject can be reconstructed.
ACKNOWLEDGEMENTS
This work was partly supported by the Austrian Science Founda
tion (FWF) under grant P13385-1NF, the European Union under
grant 1ST-1999-20273 , the Austrian Federal Ministry of Edu
cation, Science and Culture and by the innovative project ’3D
technology’ of the Vienna University of Technology.
Figure 12: Complete manually reconstructed vessel.
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