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3DIMPact Research Group, Faculty of Engineering
Wednesday 11th March 2015
G31 Foster Court, UCL
Image Sets under Directional Lighting: A Richer Representation of Cultural Heritage Objects
With a camera on a
copystand one obtains a single image of an object with a fixed (usually diffuse)
lighting geometry. In a dome illumination system, however, the same camera can
be used to capture many different images in pixel register, each illuminated
from a different direction. This turns out to be a much richer representation
than a single image, and has many applications in cultural heritage for the
digitising and display of objects that are flattish with surface relief, such
as coins, medals, fossils, rock art, incised tablets, bas reliefs, engravings,
canvas paintings, etc. This talk will describe the UCL Dome system and show how
the image sets can be used in three ways: (1) visualisation by interactive
movement of a virtual light source over the enclosing hemisphere; (2) 3D
reconstruction of the object surface; (3) modelling of the specular highlights
from the surface and hence realistic rendering.
All welcome, and there will be drinks following the talk. Please note that registration is required.