Location

Utah State University

Start Date

5-11-2011 10:15 AM

Description

This paper presents an extension of flash thermography techniques to the analysis of documents. Motivation for this research is to develop the ability to reveal covered writings in archaeological artifacts such as the Codex Selden or Egyptian Cartonnage. An emphasis is placed on evaluating several common existing signal processing techniques for their effectiveness in enhancing subsurface writings found within a set of test documents. These processing techniques include: contrast stretching, histogram equalization, image filters, contrast images, differential absolute contrast (DAC), thermal signal reconstruction (TSR), principal component thermography (PCT), dynamic thermal tomography (DTT), pulse phase thermography (PPT), and fitting-correlation analysis (FCA). The ability of flash thermography and the combined techniques to reveal subsurface writings and document strikeouts will be evaluated. In addition, the differences in flash thermography parameters are evaluated for most effective imaging of the two document subsets.

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May 11th, 10:15 AM

Document Flash Thermography

Utah State University

This paper presents an extension of flash thermography techniques to the analysis of documents. Motivation for this research is to develop the ability to reveal covered writings in archaeological artifacts such as the Codex Selden or Egyptian Cartonnage. An emphasis is placed on evaluating several common existing signal processing techniques for their effectiveness in enhancing subsurface writings found within a set of test documents. These processing techniques include: contrast stretching, histogram equalization, image filters, contrast images, differential absolute contrast (DAC), thermal signal reconstruction (TSR), principal component thermography (PCT), dynamic thermal tomography (DTT), pulse phase thermography (PPT), and fitting-correlation analysis (FCA). The ability of flash thermography and the combined techniques to reveal subsurface writings and document strikeouts will be evaluated. In addition, the differences in flash thermography parameters are evaluated for most effective imaging of the two document subsets.