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Underwater reflectance transformation imaging:a technology for in situ underwater cultural heritage object-level recording

机译：水下反射率变换成像：一种原位水下文化遗产物位记录技术

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摘要

There is an increasing demand for high-resolution recording of in situ underwater cultural heritage. Reflectance transformation imaging (RTI) has a proven track record in terrestrial contexts for acquiring high-resolution diagnostic data at small scales. The research presented here documents the first adaptation of RTI protocols to the subaquatic environment, with a scuba-deployable method designed around affordable off-the-shelf technologies. Underwater RTI (URTI) was used to capture detail from historic shipwrecks in both the Solent and the western Mediterranean. Results show that URTI can capture submillimeter levels of qualitative diagnostic detail from in situ archaeological material. In addition, this paper presents the results of experiments to explore the impact of turbidity on URTI. For this purpose, a prototype fixed-lighting semisubmersible RTI photography dome was constructed to allow collection of data under controlled conditions. The signal-to-noise data generated reveals that the RGB channels of underwater digital images captured in progressive turbidity degraded faster than URTI object geometry calculated from them. URTI is shown to be capable of providing analytically useful object-level detail in conditions that would render ordinary underwater photography of limited use.
机译：对原位水下文化遗产的高分辨率记录的需求不断增长。反射变换成像（RTI）在地面环境中具有良好的记录，可以小规模获取高分辨率的诊断数据。本文介绍的研究记录了RTI协议对水下环境的首次调整，并采用了一种可水肺部署的方法，该方法围绕可负担的现成技术进行了设计。水下RTI（URTI）用于捕获Solent和地中海西部历史性沉船中的细节。结果表明，URTI可以从原地考古材料中捕获亚毫米级别的定性诊断细节。此外，本文还介绍了实验结果，以探讨浊度对URTI的影响。为此目的，构造了原型固定照明半潜式RTI摄影圆顶，以允许在受控条件下收集数据。生成的信噪比数据表明，以渐进的浊度捕获的水下数字图像的RGB通道的降级速度要比根据它们计算出的URTI对象几何形状快。在可以限制普通水下摄影使用的条件下，URTI被证明能够提供有用的对象级细节。

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