A New Multi-spectral Imaging System for Examining Paintings
A New Multi-spectral Imaging System for Examining Paintings
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DOI：
10.2352/cgiv.2004.2.1.art00047
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发表时间：
2004-01
期刊：
影响因子：
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通讯作者：
Haida Liang;D. Saunders;J. Cupitt;Mohamed Benchouika
中科院分区：
文献类型：
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作者：
Haida Liang;D. Saunders;J. Cupitt;Mohamed Benchouika
介绍了国家美术馆开发的一种新的多光谱系统。该系统能够测量一幅画的每像素的光谱反射率。人们发现这些光谱几乎和用分光光度计记录的光谱一样精确；除了在测量点之间进行简单的三次插值外，不需要进行任何光谱重建。描述了记录光谱的过程，并对系统的精度进行了量化。一个例子是使用该系统扫描由克里维利圣玛丽抹大拉的画。使用多光谱数据，通过与使用相同系统从参考颜料获得的光谱库进行比较，试图识别画中发现的一些颜料。此外，研究表明，多光谱数据可以用来在选定的光源下渲染原画的彩色图像，并且带间比较可以帮助阐明在三色图像中不可见的绘画特征，如修饰和底图。
A new multispectral system developed at the National Gallery is presented. The system is capable of measuring the spectral reflectance per pixel of a painting. These spectra are found to be almost as accurate as those recorded with a spectrophotometer; there is no need for any spectral reconstruction apart from a simple cubic interpolation between measured points. The procedure for recording spectra is described and the accuracy of the system is quantified. An example is presented of the use of the system to scan a painting of St. Mary Magdalene by Crivelli. The multispectral data are used in an attempt to identify some of the pigments found in the painting by comparison with a library of spectra obtained from reference pigments using the same system. In addition, it is shown that the multispectral data can be used to render a color image of the original under a chosen illuminant and that interband comparison can help to elucidate features of the painting, such as retouchings and underdrawing, that are not visible in trichromatic images.