Abstract
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.
Highlights
The Queen’s Staircase at Hampton Court Palace, London, is part of a grand scheme of rebuilding commissioned by George II
Whilst environmental improvements can be assessed through the existing sensor network, monitoring of paint condition has always been more difficult because close examination of the ceiling causes major disruption to visitors
The requirement of the Conservation Team at HCP is to monitor selected areas of the ceiling over a period of time to look for evidence of surface deformation, bubbling or the formation of fine cracks that might precede the detachment of flakes of paint
Summary
The Queen’s Staircase at Hampton Court Palace, London, is part of a grand scheme of rebuilding commissioned by George II. All samples feature a loosely bound or unbound chalk layer beneath the red sealant and over the original plaster (Davies, 2006) This appears to be the interface where the delamination of the paint takes place; even during sampling the sample flake would frequently come apart from the plaster substrate at this layer. The requirement of the Conservation Team at HCP is to monitor selected areas of the ceiling over a period of time to look for evidence of surface deformation, bubbling or the formation of fine cracks that might precede the detachment of flakes of paint. The aim of the investigation described in this paper is to develop a method of imaging the paint surface which can detect the flaking process as it progresses and be deployed at long range, preferably from floor level with minimal effect on public access and palace operations. By repeating the imaging procedure at regular intervals comparison of images will provide information on rates of change, such as crack growth, surface deformation and flake formation
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