Digital Hammurabi: design and development of a 3D scanner for cuneiform tablets
Digital Hammurabi: design and development of a 3D scanner for cuneiform tablets
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数字汉谟拉比：楔形文字板 3D 扫描仪的设计和开发
DOI：
10.1117/12.641219
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Budirijanto Purnomo
中科院分区：
文献类型：
--
作者：
D. Hahn;D. Duncan;K. Baldwin;Jonathon D. Cohen;Budirijanto Purnomo
楔形文字是一种古老的书写形式，用木制的芦苇在潮湿的泥板上留下形状。干燥后，这些药片以惊人的准确性和耐久性保存了书写的文字。目前，世界各地的博物馆和私人收藏中有数十万块楔形文字泥板。这些人工制品的全球规模为希望研究它们的学者提出了几个问题。可能很难或不可能获得对给定集合的访问。此外，片剂的照片记录多次被证明不足以进行适当的检查。照片缺乏改变照明条件和观看方向的能力。作为这些问题的解决方案，我们描述了一种3D扫描仪，能够采集的形状，颜色和反射率的平板电脑作为一个完整的3D对象。然后，该数据集可以存储在在线库中，并由合适的渲染软件进行操作，该渲染软件将允许用户指定任何视图方向和照明条件。扫描仪利用照相机和远心透镜在变化的受控照明条件下获取片剂的图像。使用光度立体和结构光技术处理图像数据以确定片剂形状;从原色单色图像数据重建颜色信息。扫描表面以26.8 μm的横向间距采样，高度信息以小得多的尺度计算。相邻平板电脑侧面的扫描被配准在一起以形成3D表面模型。
Cuneiform is an ancient form of writing in which wooden reeds were used to impress shapes upon moist clay tablets. Upon drying, the tablets preserved the written script with remarkable accuracy and durability. There are currently hundreds of thousands of cuneiform tablets spread throughout the world in both museums and private collections. The global scale of these artifacts presents several problems for scholars who wish to study them. It may be difficult or impossible to obtain access to a given collection. In addition, photographic records of the tablets many times prove to be inadequate for proper examination. Photographs lack the ability to alter the lighting conditions and view direction. As a solution to these problems, we describe a 3D scanner capable of acquiring the shape, color, and reflectance of a tablet as a complete 3D object. This data set could then be stored in an online library and manipulated by suitable rendering software that would allow a user to specify any view direction and lighting condition. The scanner utilizes a camera and telecentric lens to acquire images of the tablet under varying controlled illumination conditions. Image data are processed using photometric stereo and structured light techniques to determine the tablet shape; color information is reconstructed from primary color monochrome image data. The scanned surface is sampled at 26.8 μm lateral spacing and the height information is calculated on a much smaller scale. Scans of adjacent tablet sides are registered together to form a 3D surface model.