The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XXXIX-B5
https://doi.org/10.5194/isprsarchives-XXXIX-B5-109-2012
https://doi.org/10.5194/isprsarchives-XXXIX-B5-109-2012
27 Jul 2012
 | 27 Jul 2012

CONSERVATION MONITORING OF A HERITAGE CEILING BY PHOTOMETRIC STEREO

L. MacDonald, I. Gibb, and S. Robson

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.