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virtual world using input data on structures or a light reflection model or other
physical models. Texture mapping, one MBR method, is particularly effective for
realistic three-dimensional geometric model production.
3.1 Three-Dimensional Spatial Representation
In the study, we attempted a three-dimensional spatial representation of Nishi
Hongwanji's Tora-no-ma in the following manner. First, we fixed the three-
dimensional coordinates of the room on the basis of its structural data. We then
conducted polygonal approximation with triangular patches, to generate a three-
dimensional geometric model of a scene. We then texture-mapped the actual images
onto the three-dimensional geometric model. For actual images, we used three types
of image: digitalized high-resolution images, infrared photographic images and color-
restored images.
3.2 Digital Color Restoration and Three-Dimensional Spatial Representation
We performed digital color restoration of Nishi Hongwanji's cultural properties using
data stored in digital archives, such as pigment types, granule diameters, reflection
spectra and infrared photographic images. Using color-restored images thus obtained,
we generated digital representations of
shouhekiga
in Tora-no-ma using the reflection
model, taking into consideration pigment characteristics and gilded surfaces using the
gold foil reflection model. Finally, we created a three-dimensional spatial representation
of Tora-no-ma, using
shouhekiga
images already in the digital archives and images
color-restored in this study.
(a) Part of
ranma
(front) (b) Part of
ranma
(back)
Fig. 4.
Representation of
ranma
using gold foil reflection model
