http://exhibition.3d-coform.eu/multiviewdome

文化遗产三维数字化工具。 其技术细节：



Equipped with 11 industry grade cameras, 4 projectors, a turntable and a total of 198 individually switchable light-sources, the Multiview Dome is designed to allow an automatic and rapid acquisition of the full appearance of many opaque objects. This allows for the free full-3D observation and arbitrary relighting of the digitized artefacts. The important difference to more commonplace laser- or structured-light-based systems is that light- and view-dependent changes in appearance - which in reality can be observed on virtually every material - are captured as well.

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.

Mini Dome

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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