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Featured Publication:
"VAST 2006 Best Paper Award"
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"New Reflection Transformation Imaging Methods for Rock
Art and Multiple-Viewpoint Display"
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Authors : Mark Mudge+, Tom Malzbender*, Carla Schroer+ Marlin Lum+
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+Cultural Heritage Imaging, San Francisco, California USA
* Hewlett-Packard Laboratories, Palo Alto, California USA
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Presented at: VAST 2006
The 7th International Symposium on Virtual Reality,
Archaeology and Cultural Heritage
VAST 2006 Editors: M. Ioannides, D. Arnold,
F. Niccolucci, K. Mania
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Highlight RTI Method |
Abstract
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.
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