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Approximately 240,000 digital images of the object are taken fully automatically in a single capture session, lasting from 6 to 10 hours. The resulting virtual surrogate consists of a very detailed 3D mesh and a matching bi-directional texture function (BTF). The latter being a well-suited image based format for illumination- and view-dependent material appearance: The BTF offers generation of faithful images, relighting, interactive viewing and compact storage.
This setup is especially meant to be deployed for objects exhibiting
interesting material effects, fine details or rich ornaments. The
virtual surrogate can provide the observer with the same impression as
if inspecting the real artefact, making it even possible to investigate
properties such as material composition, cracks and scratches or wear.
In contrast to previous full appearance capture setups, the Multiview
Dome can be disassembled into separate parts and easily transported and
re-assembled to allow on-site capture.
The Mini-Dome is a tool to digitise
small artefacts, for on-line presentation and analysis, including
relighting and filtering functions. This apparatus is a hemispherical
structure, with 264 white power LEDs, under computer control. There is
one overhead camera, focused on the center of this dome structure. The
dome itself consists of 4 shells, which can be easily assembled or
disassembled. For the moment, the dome yields IBR results on the basis
of estimates of local surface orientation.
Cuneiform tablets or
coins are good examples for the kind of objects we intend to digitise
with the system, and we already collaborate with the assyriologists at
the universities of Leuven and Cornell.
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