3-D Reconstruction of Iron Gall Ink Writings

Some historical writings cannot be investigated anymore without causing damage by touching or browsing them. Our work shows a non-invasive method for the 3-D reconstruction of historical writings and drawings written with an historical ink consisting of metallic particles. Since the 5th century Iron Gall Ink is in use as an indelible ink and is still in use. Modern, adaptable X-ray scanners used for material testing are able to image this ink such that it can be differentiated from the cellulose-based paper. The first part of our works proofs this assumption by taking single shot X-ray acquisitions. The second part focuses on a novel method that is able to image all pages of a book by a single circular X-ray CT scan followed by a 3-D reconstruction. Applying this method makes it possible to image complete books, writings or drawings without the need of page-turning or touching them anymore.

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