2 minute read
Society for Imaging Science and Technology
Rochester Chapter Society for Imaging Science and Technology
Website: http://rochesterengineeringsociety.wildapricot.org/ISandT
Our meeting locations have changed and additional details will be available starting with the November issue. The November meeting location is TBD. No meeting reservations are required.
Meeting Schedule:
Understanding the materials used in the creation of paintings, illuminated manuscripts and objects can improve conservation techniques and help provide evidence about the origin, techniques used, and authenticity. Significant headway has been made with non-invasive imaging techniques in the past decade. Hyperspectral imaging systems, initially used by the remote sensing community, have become more widely applied to conservation. Current pigment analysis and mapping of illuminated manuscripts involve significant manual input to create reflectance spectra maps. This research focusses on the development of algorithms that can create material maps from hyperspectral imaging with minimal user input. Algorithms to automatically select the endmembers (i.e. exemplar spectra) and classify the data accordingly have been applied. Figure 1 displays a material map where each color represents a specific known pigment used. This example used the Spectral Angle Mapper algorithm to find similarities between known spectra and the image data. Furthermore, abundance maps have been created from known spectra to display the combination of pigments used in a specific spot. This analysis used hyperspectral imagery acquired by Dr. John Delaney at the National Gallery of Art, Washington, DC, USA. The initial research focusses on one leaf of the Laudario’s of Sant’ Agnese: The Nativity with the Annunciation to the Shepherds, see Figure 2.
Biography:
Tania Kleynhans worked as a Safari guide in Southern Africa for 15 years before returning to school to further her
November 2019 (Date, time & location TBD)
Abstract:
November 2019 - "Algorithm development of Hyperspectral data for the automatic characterization of materials in illuminated manuscripts," by Tania Kleynhans
Venue ideas requested - we are soliciting input regarding other possible venues for our meetings.
is&t news
Figure 1: Pigment map created by applying Spectral Angle Mapper classification to known pigment signatures
Figure 2: Laudario’s of Sant’ Agnese: The Nativity with the Annunciation to the Shepherds
education. She received her Bachelors degree in Mathematics and Operational Research from the University of South Africa, and an M.S. in Imaging Science at the Rochester Institute of Technology. Currently, Tania Kleynhans is an Associate Scientist at the Chester F. Carlson Center for Imaging Science, RIT, and are completing her Ph.D part time. She works with various groups at the Center for Imaging Science, for example the UAV research (as pilot), Algorithm development for the Landsat Satellite series, and historical document imaging projects. Her Ph.D research involve creating novel algorithms to classify pigments in works of art in collaboration with the National Gallery of Art in Washington.
NOVEMBER 2019 The ROCHESTER ENGINEER | 23
