Abstract

In Document Restoration our main focus is analyzing documents through pigment analysis and image enhancements. We are currently working on finding corrections on the Selden Map of China created during the Ming Dynasty in the 1600s. We work with illegible texts that have either been erased, covered up or faded. We use hyper-spectral imaging which consists of several hundred color bands, and multi-spectral imaging which consists of less than 50 color bands. The spectral imaging allows for a more precise and detailed image than normal red, green and blue (RGB) images, making it more legible and visible to the human eye. We use techniques such as Principal Component Analysis (PCA), Spectral Angle Mapper (SAM) and Mahalanobis Distance. These techniques show inconsistencies in the paint and identify where different pigments are located, which could point to a later addition or correction. These same principles are applied when working with illegible written text, typically being palimpsests, in which text has been scraped off and written over. These identified markings are then investigated and researched.

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