DIRS Laboratory 76-3215
July 11, 2019 at 1:30am
Tyler Peery
Ph.D. Thesis Defense



Cultural heritage spectral imaging is becoming more prevalent with the increased affordability of more complex imaging systems, including multi- and hyperspectral imaging (MSI and HSI) systems.  HSI systems tend to sacrifice spatial pixels for additional spectral information, and diffracting the light into its constituent parts reduces an HSI signal one to two orders of magnitude relative to typical RGB or MSI framing cameras.  Requiring more illumination can be burdensome in cultural heritage imaging, where potentially sensitive targets are protected under various illumination standards.  In this research, spatial resolution is used as a trade space, increasing ground sample distance (GSD) to improve signal-to-noise ratios (SNRs).  Panchromatic sharpening is applied to recover sacrificed spatial detail, fusing together a high-spatial resolution panchromatic image with the HSI image.  A 14th-century manuscript was imaged with an HSI detector under museum lighting levels of 50 lux, based on the United Kingdom standard for cultural heritage display at museums, PAS 198:2012.  Detector systems are investigated that can utilize this technique, as well as additional methods of data capture to assist in the processing of sensitive cultural heritage documents while preserving their physical condition.