This area of imaging something with many different light positions was pioneered by HP labs. PTM is "Polynomial Texture Mapping" refers to the technique of using all the images taken in order to make a virtual image for any light source direction (it is easier to look at an example to understand this).
January 2012 saw the completion of Dome3 - and its use in the Louvre Museum in Paris.
in June 2011 we did a special scan of a Rembrandt at the National GalleryYou can also see the Amazon head PTM in this page (requires Java)
In the AHRC-funded RTI imaging project with Oxford, the Ashmolean and Archaeology we developed RTI Dome for higher resolution and faster PTM imaging of ancient artefacts.
This project focussed on speed and efficiency of a system, building upon ideas from the whole community. The two domes produced are in use for various imaging campaigns
Our imaging systems use around 80 very bright Leds and a Nikon D3x
Building these structures is quite complex and they are not very portable - I worked with Graeme Earl from our Archaeology dept. to investigate a more portable unit for their digs I was interested to see what could be done on battery power, with powerful white LEDs and a moving structure. We designed a moving-arm system which was small and could be battery-powered.
This National Gallery London prototype made by Joseph Padfield has a nice demonstration of images of paintings.
C-H-I pioneers many imaging systems
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