Multi-Dimensional Analysis of An Multi-Dimensional Analysis of An Oil PaintingOil Painting
Center of Imaging Science
Rochester Institute of Technology
Pano Spiliotis
May 7,1999
OverviewOverview
• Background
• Procedure
• Results
• Evaluation of data
• Conclusion
BackgroundBackground
• Multi-dimensional segmentation.– Using image capturing protocols and multi-
dimensional segmentation, artifacts that are present in works of art will be easily identified.
• New approach in finding artifacts in oil paintings.
OverviewOverview
• Background
• Procedure
• Results
• Evaluation of data
• Conclusion
Camera SetupCamera Setup
• Monochrome CCD camera
• Ultraviolet Black Light (Blue light)
• Tungsten Light Source
• Infrared Filter
Important that images
are in registration.
IlluminationIllumination
• Three types– Ultraviolet– Visible– Infrared
Ultraviolet IlluminationUltraviolet Illumination
• Ultraviolet Illumination– New Varnish– Over-painting
Visible IlluminationVisible Illumination
• Topographical Inspection– Canvas Repair– Buckling of Canvas– Over-painting
Infrared IlluminationInfrared Illumination
• Infrared filter is presented to the system.– Under-drawing– Areas that are not present in the UV and VIS.
Flat FieldingFlat Fielding
• Procedure taking a non-uniformly illuminated image and resulting in an evenly illuminated image.
non-uniformly illuminated image Flat-fielded image
Image Segmentation
• Looking for common areas.
• Segmentation of a common area.
• Trial and error.
• Save common area as an image and pixel value.
OverviewOverview
• Background
• Procedure
• Results
• Evaluation of data
• Conclusion
Results
Visible image Infrared image
Ultraviolet image
2-D Segmentation Program
Visible Image
Infrared Image
Visible Image
Infrared Image
Pseudo Coloring
Visible Image
Infrared Image
After Segmentation
Visible Image
Infrared Image
Visible Image
Infrared Image
OverviewOverview
• Background
• Procedure
• Results
• Evaluation of data
• Conclusion
Evaluation of results
• Areas that have been segmented reveal artifacts.
• John Sutton, Associate Conservator from The West Lake Conservators, was called in to prove these findings.
• The halo is not the original halo painted.
ConclusionConclusion
• Research proved to be successful.
• 2-D Segmentation provides art conservator’s with a tool to validate their discoveries.