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3. Using the generated reflection distribution filter (It has the RGBA value) and
using the restored wall painting image (Fig.13.(b)), the image compositing is
done by alpha blending. (Fig.13.(c))
(a) Outline (b) Taking a picture method
Fig. 12.
Achievement of virtual source of light that uses reflection distribution filter
(a) (b) (c)
Fig. 13.
Image compositing that uses reflection distribution filter
6.2 Interaction by The Virtual Source of Light
To change the optical image of the wall painting it is necessary to presume the
position of a virtual source of light according to the position of the virtual source of
light (i.e. penlight) that the user had. That is, the luminescence part of a virtual source
of light is assumed to be a marker. It takes image of the marker with two cameras.
The position of a virtual source of light is presumed by using the obtained stereo
image. A synthetic image corresponding to the presumed position is displayed. Thus,
when the position of taking a picture and the position of a virtual source of light are
the same, a synthetic image is displayed as it is. When the position of a virtual source
of light is different the weight putting is done to the image in neighborhood at the
virtual source of light position and the image is generated. Fig.14. shows the result of
doing the interaction by using a virtual source of light.
