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Publication Detail
Modelling the appearance of heritage metallic surfaces
  • Publication Type:
    Conference
  • Authors:
    MacDonald LW, Hindmarch J, Robson S, Terras M
  • Publisher:
    ISPRS
  • Publication date:
    2014
  • Pagination:
    371, 377
  • Published proceedings:
    ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
  • Volume:
    XL-5
  • Name of conference:
    ISPRS
  • Conference place:
    Riva del Garda, Italy
  • Conference start date:
    01/06/2014
  • Conference finish date:
    01/06/2014
  • Keywords:
    Cultural Heritage, Imaging, 3D model, Photogrammetry, Photometric stereo, Rendering, Specularity
  • Addresses:
    UCL
Abstract
Polished metallic surfaces exhibit a high degree of specularity, which makes them difficult to reproduce accurately. We have applied two different techniques for modelling a heritage object known as the Islamic handbag. Photogrammetric multi-view stereo enabled a dense point cloud to be extracted from a set of photographs with calibration targets, and a geometrically accurate 3D model produced. A new method based on photometric stereo from a set of images taken in an illumination dome enabled surface normals to be generated for each face of the object and its appearance to be rendered, to a high degree of visual realism, when illuminated by one or more light sources from any angles. The specularity of the reflection from the metal surface was modelled by a modified Lorentzian function.
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Dept of Civil, Environ &Geomatic Eng
Author
Dept of Civil, Environ &Geomatic Eng
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Dept of Information Studies
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