29 December 1993 Registration of transportation damages using a high-resolution CCD camera
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Abstract
This paper proposes a new approach to monitor the condition of a painting. That is the acquisition of the surface structure of the painting. As transportation damages are known to affect the crack pattern, very detailed images (cracks < 0.1 mm) are required. A compromise between this requirement and today's feasibility consists in using resolutions of about 20 pixel/mm with 8 bit, meaning images of 20k X 20k for a painting of 1 m X 1 m. A Kontron ProgRes 3000 on a high precision 3D motorized frame (repositioning accuracy < 0.01 mm) is used for the acquisitions before and after transportation. Each pair of images is resampled to compensate for geometrical distortions. The crack network is then detected by using line detection algorithms derived from mathematical morphology. The images are finally superimposed and changes can be detected manually or automatically. While the main focus of this contribution is spent on technical details, case studies are used to discuss recent applications.
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Manfred Mueller, Andreas Burmester, "Registration of transportation damages using a high-resolution CCD camera", Proc. SPIE 1987, Recording Systems: High-Resolution Cameras and Recording Devices and Laser Scanning and Recording Systems, (29 December 1993); doi: 10.1117/12.165182; https://doi.org/10.1117/12.165182
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