テラヘルツ波による画像解析で、近世の十字架に刻まれた文字が発見される(Terahertz Imaging Reveals Hidden Inscription on Early Modern Funerary Cross)

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2022-04-25 ジョージア工科大学

ジョージア工科大学とジョージア工科大学ロレーヌ校の研究者は、学際的なプロジェクトにおいて、テラヘルツイメージングと信号処理技術を使用して、16世紀の鉛製葬儀用十字架の腐食表面の下を調べました。電気・コンピュータ工学部(ECE)のDavid Citrin教授が率いるこのプロジェクトでは、画像処理研究者、考古学上の物品を専門とする化学者、美術史家が協力して、時間の経過とともに見えなくなっていた「主の祈り」の銘文を明らかにすることに成功しました。

<関連情報>

テラヘルツ・マルチスペクトルイメージングによる近世鉛製十字架の時間経過による銘文変化の解明 Revealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging

Junliang Dong,Ana Ribeiro,Aurélien Vacheret,Alexandre Locquet &D. S. Citrin
Scientific Reports  Published: 02 March 2022
DOI:https://doi.org/10.1038/s41598-022-06982-2

テラヘルツ波による画像解析で、近世の十字架に刻まれた文字が発見される(Terahertz Imaging Reveals Hidden Inscription on Early Modern Funerary Cross)

Abstract

The presence of a corrosion layer on lead art and archæological objects can severely impede the interpretation of inscriptions, thus hampering our overall understanding of the object and its context. While the oxidation of lead that dominates corrosion may be chemically reversible via reduction, potentially providing some access to inscriptions otherwise obscured by time, corrosion damage is overall neither entirely reversible nor is the reduction process in all cases easy or feasible to carry out. In this study, by taking advantage of the unique penetration ability of terahertz radiation and the abundant frequency bands covered by a single-cycle terahertz pulse, we perform nondestructive terahertz multispectral imaging to look under the corrosion on a sixteenth century lead funerary cross (croix d’absolution) from Remiremont in Lorraine, France. The multispectral images obtained from various terahertz frequency bands are fed into a judiciously designed post-processing chain for image restoration and enhancement, thus allowing us for the first time to read obscured inscriptions that might have otherwise been lost. Our approach, which brings together in a new way the THz properties of the constituent materials and advanced signal- and image-processing techniques, opens up new perspectives for multi-resolution analysis at terahertz frequencies as a technique in archæometry and will ultimately provide unprecedented information for digital acquisition and documentation, character extraction, classification, and recognition in archæological studies.

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