Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-5, 371-377, 2014
https://doi.org/10.5194/isprsarchives-XL-5-371-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
06 Jun 2014
Modelling the appearance of heritage metallic surfaces
L. MacDonald1, J. Hindmarch1, S. Robson1, and M. Terras2 1Dept. of Civil, Environmental & Geomatic Engineering, UCL, London, UK
2Centre for Digital Humanities, Dept. of Information Studies, UCL, London, UK
Keywords: Cultural Heritage, Imaging, 3D model, Photogrammetry, Photometric stereo, Rendering, Specularity 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.
Conference paper (PDF, 1416 KB)


Citation: MacDonald, L., Hindmarch, J., Robson, S., and Terras, M.: Modelling the appearance of heritage metallic surfaces, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-5, 371-377, https://doi.org/10.5194/isprsarchives-XL-5-371-2014, 2014.

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