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首页> 外文会议>Optics for arts, architecture, and archaeology IV >Automated analysis of art object surfaces using time-averaged digital speckle pattern interferometry
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Automated analysis of art object surfaces using time-averaged digital speckle pattern interferometry

机译：使用时间平均数字散斑图案干涉法自动分析艺术品表面

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Technical development and practical evaluation of a laboratory built, out-of-plane digital speckle pattern interferometer (DSPI) are reported. The instrument was used for non-invasive, non-contact detection and characterization of early-stage damage, like fracturing and layer separation, of painted objects of art. A fully automated algorithm was developed for recording and analysis of vibrating objects utilizing continuous-wave laser light. The algorithm uses direct, numerical fitting or Hilbert transformation for an independent, quantitative evaluation of the Bessel function at every point of the investigated surface. The procedure does not require phase modulation and thus can be implemented within any, even the simplest, DSPI apparatus. The proposed deformation analysis is fast and computationally inexpensive. Diagnosis of physical state of the surface of a panel painting attributed to Nicolaus Haberschrack (a late-mediaeval painter active in Krakow) from the collection of the National Museum in Krakow is presented as an example of an in situ application of the developed methodology. It has allowed the effectiveness of the deformation analysis to be evaluated for the surface of a real painting (heterogeneous colour and texture) in a conservation studio where vibration level was considerably higher than in the laboratory. It has been established that the methodology, which offers automatic analysis of the interferometric fringe patterns, has a considerable potential to facilitate and render more precise the condition surveys of works of art.
机译：报告了实验室建造的平面外数字散斑图案干涉仪（DSPI）的技术发展和实际评估。该仪器用于无创，非接触式检测和表征涂漆艺术品的早期损伤（如破裂和分层）。开发了一种用于使用连续波激光记录和分析振动物体的全自动算法。该算法使用直接的数值拟合或Hilbert变换对研究表面的每个点处的Bessel函数进行独立，定量的评估。该过程不需要相位调制，因此可以在任何甚至最简单的DSPI设备中实现。所提出的变形分析是快速的并且计算上便宜。尼古拉·哈伯施拉克（Nicolaus Haberschrack）（活跃于克拉科夫的一位中晚期画家）从克拉科夫国家博物馆的藏品中诊断出一幅画板表面的物理状态，以此作为开发方法在现场应用的一个例子。它允许在振动级别比实验室高得多的保护工作室中评估真实绘画表面（异质颜色和纹理）的变形分析的有效性。已经确定的是，提供对干涉条纹图案的自动分析的方法学具有促进和更精确地进行艺术品状况调查的巨大潜力。

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