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Details for Image Capture and Processing for Enhancing the Legibility of Incised Texts
NameImage Capture and Processing for Enhancing the Legibility of Incised Texts
DescriptionAbstract: This paper presents methodologies that have been adopted to enhance the legibility of incised texts, in particular Roman wooden stylus tablets, for which the texts consist of the incisions left in the wood through a now-perished coat of wax originally covering the wood. Digitization of such artefacts is the first step in the development of an interpretation of the document. At this stage, mimesis of the real-world strategy of the classicists is a guiding principle. Taking into account the 3D nature of the document, shadow-stereo and reflectance transformation imaging allow us to capture and to encode multiple images of the text under varying illumination conditions for further processing and visualization. Image processing algorithms were developed to isolate the text features. Background correction is first performed; then ways to achieve text feature extraction have been explored: phase congruency, which exploits the fact that visual features are detected for some properties of local phase of the image in the Fourier domain; and Markov Random Fields, which take a statistical approach to region labelling for image segmentation. Most techniques used here were inspired by approaches adopted by medical image processing. These methods had however to be largely adapted to our specific application; in general, the images of artefacts and their features of interest are not only different from medical images, also the type of visual expertise required to detect the text features differs greatly from that of radiologists. We conclude by observing that by better understanding the nature of the classicists visual expertise, we will further be able to integrate prior knowledge into a model of visual perception adapted to the classicists needs, hence supporting them in building meaning out of a pure signal, in building an interpretation of an artefact. [To appear in Commentationes Humanarum Litterarum,  published by Societas Scientiarum Fennica, 2010]  
Filesize2.85 MB
Filetypepdf (Mime Type: application/pdf)
Created On: 10/08/2010 11:28
Maintained byEditor
Hits22896 Hits
Last updated on 10/08/2010 11:32
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