So that combination, with us putting together some training programs a little more focused in the museum community, really just brought this idea together. There was a lot of interest among the rock art community in this technology. We have used it successfully in a couple of different rock art sites, and we have presented some of our work at the American Rock Art Research Association Conference. And so once you have it in the computer, you can dynamically relight the object from any angle as well as apply some mathematical enhancements to bring out very fine surface details that could be difficult or even impossible to see with the naked eye. And then that’s processed on the computer to a new type of image that generates the surface information based on how the light reflects off of the object. Reflectance Transformation Imaging allows you to create a very detailed model of the surface of an object, and you do that by taking a sequence of digital photographs with a light in different positions around the object. And RTI is a really great technique for bringing out very fine surface details of an object. Schroer: We’ve been working for some time with a number of technologies, but one of the key technologies is called Reflectance Transformation Imaging or RTI. Jeff Guin: Let’s step back for a minute and discuss how you came up with the idea for the workshop. It was great to have their expertise on the project as well. And that is Tom Nobel and Neffra Matthews, who have been doing photogrammetry for a very long time. So that was our primary group of folks and then the number-one group I want to bring out, who co-taught the workshop with us, were photogrammetry experts at the Bureau of Land Management National Operations Center in Denver. And on the technology side, we had support from one of the senior researchers at Hewlett Packard Labs, computer graphic researchers at Princeton University, and also the University of California Santa Cruz. We worked with the National Museum of the American Indian, which is part of the Smithsonian, the Presidio Archeology Program and a couple of archeologists from U.C. Jeff Guin:What are some of the other organizations you work with?Ĭarla Schroer: So we collaborate with a lot of people in all of our projects, and for this particular project, we just had a tremendous group of collaborators. And we also collaborate with technical organizations to help develop technology and methodology. And so we do that by working with museums and archeologists and sites to help them develop imaging technology. Why don’t you just start by telling us about your organization, Cultural Heritage Imaging.Ĭarla Schroer: Cultural Heritage Imaging is a non-profit organization that’s based in San Francisco, and we drive both the development and the adoption of practical digital imaging solutions for people that are passionate about saving humanity’s legacy. Jeff Guin: Carla, Thanks so much for being on the podcast. James Barry, National Park Service Cultural Heritage Imaging
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