Volume XXXIX-B5
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B5, 109-114, 2012
https://doi.org/10.5194/isprsarchives-XXXIX-B5-109-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B5, 109-114, 2012
https://doi.org/10.5194/isprsarchives-XXXIX-B5-109-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  27 Jul 2012

27 Jul 2012

CONSERVATION MONITORING OF A HERITAGE CEILING BY PHOTOMETRIC STEREO

L. MacDonald1, I. Gibb2, and S. Robson1 L. MacDonald et al.
  • 1Photogrammetry, 3D Imaging and Metrology Research Centre, University College London WC1E 6BT, UK
  • 2Conservation Collection Care, Hampton Court Palace, Historic Royal Palaces, Surrey KT8 9AU, UK

Keywords: Architecture, conservation, monitoring, camera, imaging, reconstruction

Abstract. Photographic survey techniques were employed to monitor the condition of the paintwork on the ceiling of the Queen's Staircase at Hampton Court Palace. Illumination was provided by a flash, mounted on an 8 metre telescopic mast, raised to approximately 60 cm below the ceiling, with images were taken from a fixed camera position on the floor of the landing at a range of 6.5 m. The photometric stereo method was applied to images from ten lamp positions, to calculate surface normals and a depth map. Cross-sections at the estimated surface resolution of 7.7 pixels/mm, achieved a depth (Z axis) resolution of approximately 100 microns.