It may be seen from the results of this experiment that an 
accuracy of the artificial retina camera shows lower values than 
the CCD camera. These results due to the insufficient image 
quality which was caused by the low resolution of the artificial 
retina camera and it will be suspected that the application fields 
are restricted due to low resolution. 
However, considering the artificial retina camera was used in this 
paper is the first lot which was developed as a sample, it is 
expected that the resolution will be sure to improve. Therefore, 
the artificial retina camera will become useful tool for real-time 
image sensing fields. 
5 APPLICATION FOR VIRTUAL ARCHEOLOGY 
monitor so that a view point can be recognized by tracking a 
feature point instead of an optical flow. 128x128 pixel image 
were adopted similar to the resolution of the artificial retina 
camera. As an additional function, people can appreciate 3D 
relics from several view points using liquid crystal shutter 
glasses. Figure 6 shows the liquid crystal shutter glasses. 
In order to construct a virtual archeological museum, 3D relics 
models corresponding to several view points should be generated. 
Color modeling is needed to create this reality. With this object, 
the authors have been concentrating on developing a real-time 
ortho imaging, drawing and modeling system for a recording 
system of relics using a CCD camera and line lasers and the 
effectiveness as an application of this system to a virtual 
archeological museum was demonstrated [Chikatsu. H and 
Anai.T, 1998]. An outline of the virtual archeological museum 
which was developed by the authors was follows that 3D models 
corresponding to various view points are obtained using an 
animation technique and people can appreciate relics from several 
view points using a mouse. 
This paper intend to develop an automatic appreciation system 
that relics automatically rotate corresponding to various view 
point which are obtained by image processing procedure instead 
of mouse in the virtual archeological museum. 
An optical flow function of the artificial retina camera is expected 
to become useful tool for this purpose. Figure 5 shows optical 
flow image using the artificial retina camera and it may be seen 
that the optical flow can be acquired corresponding to movement 
of human face. 
Figure 6 Liquid crystal shutter glasses 
The detail procedures of the automatic appreciation system are 
as follows: 
1. White marker is set on the liquid crystal shutter glasses as a 
feature point. 
2. In order to speed up image processing procedure, a window is 
cut out so that the maker can be included. 
3. Feature point for the first image is extracted by binanzation. 
4. The area of the marker at the first image is calculated. 
5. Similar, the coordinate for the center of the marker at the first 
image is calculated as a center of area gravity. 
6. Binarization and labeling procedure are performed for the 
same window area in the next image. 
7. Marker in the next image is extracted as the area which have 
the most near values compare with the first marker area. 
8. The center of area gravity for the extracted marker is 
calculated. 
9. Calculate the vector of the marker. 
10. Relics atomically rotate corresponding to the vector. 
Figure 7 shows the binarization of the marker and these 
procedures are shown in Figure 8. 
Figure 5 Optical flow image by the artificial retina camera 
However, real-time data acquisition of optical flow became issue. 
Due to the artificial retina camera was the sample lot, there is no 
function to get these values in real-time. Therefore, as the CCD 
camera was adopted instead of the artificial retina camera in this 
paper, but real-time image processing procedure still issue. 
Then, following system was developed for I achieving an 
automatic appreciation system. The CCD camera was set on a PC 
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