Shadow stereo, image filtering, and constraint propagation

M Brady, X B Pan, V Schenk, Melissa Terras, P Robertson, N Molton

    Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

    Abstract / Description of output

    It is agreed that stilus tablets are very important documentary sources, however they are the most difficult to decipher. The difficulties in deciphering them is due to the rough surface of the tablets, the low brightness contrast of the incisions, the dense wood-grain lines, and the badly stained and pitted nature of the tablets. All of these posit a challenge for conventional two-dimensional (2D) image analysis. This chapter aims to provide a system that would aid the historian in interpreting stilus tablets by improving the legibility of the tablets. It provides novel ways of determining the texts incised on the tablets. One of these is the use of three-dimensional (3D) image analysis techniques. Such a technique is capable of detecting incisions, compared to the 2D image analysis, and is portable and inexpensive. Another method that can be used is the use of shadow stereo. This method employs low raking angle light close to the plane of the tablet at different elevations. The chapter also discusses the image formation process and the process of choosing elevations for each azimuth direction. The chapter also includes a discussion on realizing the shadow stereo algorithm.
    Original languageEnglish
    Title of host publicationImages and Artefacts of the Ancient World
    EditorsA.K. Bowman, M. Brady
    Publisher British Academy Scholarship Online
    Pages15-30
    ISBN (Print)9780191734533
    DOIs
    Publication statusPublished - 2005

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