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Friday, June 1 • 4:30pm - 5:00pm
(Imaging Technology) Integrating Multispectral Imaging, Reflectance Transformation Imaging (RTI), and Photogrammetry for Archaeological Objects

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This project utilizes a 3D-model built with photogrammetry as scaffolding for the combined display and analysis of other types of imaging data, such as Reflectance Transformation Imaging (RTI), and broadband Multispectral Imaging (MSI). Photogrammetry, RTI, and broadband MSI are well-established imaging techniques widely used by cultural heritage professionals. These techniques have seen rapid adoption by archaeologists and conservators working together in the field. While recognizing that no technique produces a perfect or undistorted representation, the data that this project integrates complement each other very effectively and result in high-resolution and visually expressive renderings that emphasize physical shape, surface variability, and spectral properties. Combining techniques facilitates very detailed study and visualization of an artifact that both highlights otherwise invisible features. Furthermore, it can effectively communicate these aspects without requiring direct inspection or handling of the object. Three-dimensional models were built of a stone object from Sardis, Turkey and an Egyptian painted wood fragment using Agisoft Photoscan Pro. RTIs were created of the worked surfaces of each using the RTIBuilder 2.0.2 available from Cultural Heritage Imaging (CHI). MSI images were processed with the add-in for nip2, the graphical interface of the free processing system VIPS, developed as part of the CHARISMA project, available from the British Museum. So-called “connection images” were used to integrate and align the data sets. These evenly lit images, taken with the same camera position and parameters as the auxiliary data sets, are included in the set of images used to build the 3D model with photogrammetry. The data sets were combined and visualized using Blender, an open-source 3D graphics and animation software. We stress that this project uses software, equipment, and methods that are readily accessible to conservators and archaeologists in museum photo studios and in the field. We have also established a workflow for combining potentially any source of imagery. This technique shows promise for many applications where advanced visualization can contribute to analysis and conservation treatment, particularly in situations where ongoing contact with the object is limited or ill advised. In summary, the successful combination of RTI, MSI, and photogrammetry data sets results in 3D models that support compelling interactive visualization and analysis of archaeological materials.

Speakers
avatar for Emily Frank

Emily Frank

Graduate Student – Andrew W. Mellon and NEH Fellow in Conservation, New York University/Yale University Art Gallery
Emily Frank is a fourth year objects conservation student at the Conservation Center, Institute of Fine Arts, New York University where she is pursuing a Joint Masters of Art in Art History and Masters of Science in Conservation of Historic and Artistic Works. She is currently completely... Read More →

Co-Authors
avatar for Dr. Sebastian Heath

Dr. Sebastian Heath

Clinical Assistant Professor of Ancient Studies, Institute for the Study of the Ancient World, New York University
Sebastian Heath is a specialist in Roman pottery, the Roman economy, and the application of digital technologies to the study of the ancient Mediterranean. He has participated in excavations and surveys in Cyprus, France, Greece, Israel, Italy, Tunisia, Turkey, and the United Kingdom... Read More →
avatar for Chantal Stein

Chantal Stein

Graduate Student – Marica & Jan Vilcek Fellow in Conservation, New York University
Chantal Stein is pursuing a joint Masters of Art in Art History and Masters of Science in Conservation of Historic and Artistic Works at the Conservation Center of the Institute of Fine Arts, New York University. She is currently a third year objects conservation student. She has... Read More →

Friday June 1, 2018 4:30pm - 5:00pm
Texas Ballroom D Marriott Marquis Houston

Attendees (106)