W3 Reflectance Transformation Imaging

Tomasz Łojewski

Workshop on the Reflectance Transformation Imaging.

Reflectance Transformation Imaging (RTI) – also known as Polynomial Texture Mapping (PTM)   – is a computational imaging technique used to capture and visualise in an interactive manner specific features of the objects’ surface. RTI enables to re-light subjects’ surface from any direction and to enhance texture details which cannot be seen and captured with any other imaging methods or naked eye. The method have found numerous implementations for the study and documentation of archival and museum objects –  clay tablets, ceramic objects, metal and wood objects, corroded glass, coins, manuscripts on paper and parchment, book covers, dry-stamps, dry-point glosses, various painted surfaces. RTI images can be viewed, studied and annotated with the use of a dedicated freeware software (RTIViewer), as well as (with some restrictions compared to the previous) in a web browser window, thus allowing for a new dimension of museum virtual visits. During the workshop, following presentation on RTI basics, several objects would be documented with the technique, using an automated illumination dome (35 cm in diameter) allowing also for multispectral imaging (UV/VIS/NIR).  Participants will be encouraged to bring their own objects for texture imaging. More information on the technique: home.agh.edu.pl/lojewski (tab: rti-ptm).

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