Acquiring the reflectance field of a human face
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
EGRW '02 Proceedings of the 13th Eurographics workshop on Rendering
Photometric stereo for archeological inscriptions
SIGGRAPH '04 ACM SIGGRAPH 2004 Sketches
VAST'05 Proceedings of the 6th International conference on Virtual Reality, Archaeology and Intelligent Cultural Heritage
Illustration of complex real-world objects using images with normals
Proceedings of the 5th international symposium on Non-photorealistic animation and rendering
Multiscale shape and detail enhancement from multi-light image collections
ACM SIGGRAPH 2007 papers
Dynamic shading enhancement for reflectance transformation imaging
Journal on Computing and Cultural Heritage (JOCCH)
Printing reflectance functions
ACM Transactions on Graphics (TOG)
Reflectance transformation imaging systems for ancient documentary artefacts
EVA'11 Proceedings of the 2011 international conference on Electronic Visualisation and the Arts
Visualising an egyptian artefact in 3D: comparing RTI with laser scanning
EVA'11 Proceedings of the 2011 international conference on Electronic Visualisation and the Arts
Robust estimation of surface properties and interpolation of shadow/specularity components
Image and Vision Computing
VAST'08 Proceedings of the 9th International conference on Virtual Reality, Archaeology and Cultural Heritage
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We offer two new methods of documenting and communicating cultural heritage information using Reflection Transformation Imaging (RTI). One imaging method is able to acquire Polynomial Texture Maps (PTMs) of 3D rock art possessing a large range of sizes, shapes, and environmental contexts. Unlike existing PTM capture methods requiring known light source positions, we rely on the user to position a handheld light source, and recover the lighting direction from the specular highlights produced on a black sphere included in the field of view captured by the camera. The acquisition method is simple, fast, very low cost, and easy to learn. A complementary method of integrating digital RTI representations of subjects from multiple viewpoints is also presented. It permits RTI examination "in the round" in a unified, interactive, image-based representation. Collaborative tests between Cultural Heritage Imaging, Hewlett- Packard Labs, and the UNESCO Prehistoric Rock-Art Sites in the Côa Valley, a World Heritage Site in Portugal, suggest this approach will be very beneficial when applied to paleolithic petroglyphs of various sizes, both in the field and in the laboratory. These benefits over current standards of best practice can be generalized to a broad range of cultural heritage material.