- 89 - 
7. CONCLUSION 
Figure 20. The automatic restoration example by using 
a point: 2 
(ЦЩ) (ШШ) 
Figure 21. The automatic restoration example by using 
a point: 3 
A new approach is proposed in this paper that automatically 
restores a surface model of an object with a complicated shape 
from the CT slice images. Model generation from CT images so 
far requires not only complicated CAD operation but also 
intervention of a man. The method proposed makes it possible 
to automatically restore surface models of objects with 
complicated shapes. Compared with the thin model restored 
with a laser measurement, it becomes easy to Catch the shape of 
a fragment by leaps and bounds. Further efficiency of a 
restoration task is improved by using the thickness of each 
fragment. 
Problems to be solved include the improvement in the 
smoothness of a curved surface and the reduction of data 
volume. There are often cases where the unevenness is 
conspicuous because all shading is currently set to the same 
value. Taking a proper normal vector can be more smooth 
model. Even for the portion of little inclination the size of a grid 
is established in the same value. This is the cause that data 
volume increases idly. This is also solvable if different values 
are given to grids included in the areas of intense changes. 
We showed the possibility of the automatic restoration by 
extracting a section and setting a point. The system cannot 
search all corresponding cross section. However, this system is 
more very efficient than the manual operation. By getting a relic 
number from this automatic restoration result, this system is 
useful as the restoration simulator. 
References: 
Yasuhiro Watanabe, Kazuaki Tanaka, Norihiro Abe, Hirokazu 
Taki, Yoshimasa Kinoshita, Akira Yokota: Measurement of 
Fragments with MRI and Relic Restoration Using Virtual 
Reality Technologies, the Transactions of the Institute of 
Electronics, Information and Communications Engineers of 
Japan (D-II), Vol. J82-DII No.2, pp.259-267, 1999. 
Yasuhiro Watanabe, Kazuaki Tanaka, Norihiro Abe, Hirokazu 
Taki, Yoshimasa Kinoshita, Akira Yokota: Surface model 
generation by the relics from slice images and the approach 
to the automatic restoration, International Cultural Heritage 
Information Meeting (ICHIM01), pp.201-214, 2001. 
Figure 22. The automatic restoration example by using a 
point: 4 
But, the system cannot search all corresponding cross section. 
In the case, we must restore by using the original restoration 
system. However, this system is more very efficient than the 
manual operation.