Revealing hidden text in rolled and folded papyri

Abstract

only along one fold line. To minimize distortions at this stage, we apply the method of moving least squares. In the second stage, the papyrus is flattened, which requires the definition of a medial surface. We have applied our software framework to several papyri. In this work, we present the results of applying our approaches to mockup papyri that were either rolled or folded along perpendicular fold lines. In the case of the folded papyrus, our approach represents the first attempt to address the unfolding of such complicated folds.

4D imaging of lithium-batteries using correlative neutron and X-ray tomography with a virtual unrolling technique

“…However, it can be challenging to extract meaningful spatial information from a spiral-wound structure. To facilitate interpretation of the spatial data along the electrode length, a plug-in from the Amira Software Package was applied, which was created by Konrad-Zuse-Zentrum Berlin (ZIB) 34 for virtually unrolling the spiral-wound structure and take ARTICLE measurements along its length. This enables analysis of morphological changes and degradation processes inside the battery electrodes as well as on its surface, and more direct correlation and comparison of the multi-modal image data.…”

“…It is generally possible to extract small flattened areas out of a 3D volume, but these areas mostly do not deliver meaningful results. To overcome this, we applied a plug-in for Amira (Amira 6.5, ZIB/ Thermo Fisher Scientific, Germany/USA), which was created by the ZIB 34 , to get access to our data. Originally developed for papyri unfolding project, we used this plug-in for battery unrolling.…”

“…To effectively evaluate and compare these multi-modal results, a methodology for virtually 'unrolling' the characteristic spirally wound cell captured in the 3D tomograms is used [32][33][34] : This provides an effective means for data visualisation and correlation, which, moreover, reveals erstwhile unseen trends in the spatial distribution of performance within these cells. While X-ray CT is increasingly widespread in its application to Li batteries, this methodology of correlative imaging and data presentation/ visualisation will provide a new benchmark for battery characterisation.…”

Aplicação de técnicas de análise síncrotron em arqueologia

“…Ela já é amplamente utilizada no estudo de fósseis, permitindo análises morfológicas, reconstruções anatômicas e acesso a estruturas internas preservadas nos remascentes dos organismos. A tomografia por absorção de raios X também teve seu potencial demonstrado para a leitura de rolos de pergaminho sem a necessidade de desenrolá-los (Baum et al 2017), baseando-se no fato de que as tintas utilizadas nesses materiais usualmente são à base de ferro, gerando grande diferença de densidade em relação à estrutura de fibras vegetais ou animais (Mills et al 2012). O uso desse tipo de abordagem permite a análise de artefatos e bens culturais com uma grande redução de seu manuseio, contribuindo para sua preservação (Figura 3).…”

Layered Surface Detection for Virtual Unrolling

“…The research community working with virtual unrolling for cultural heritage applications has paid most attention to the choice of imaging techniques and modality [5], [6], and only limited focus is given to automated and reliable image processing [7]. Therefore, most proposed methods require intense manual input, which is justified when processing few and unique data sets.…”