CONSERVATION MONITORING OF A HERITAGE CEILING BY PHOTOMETRIC STEREO
- 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.