Hahn Daniel V, Baldwin Kevin C, Duncan Donald D
The John Hopkins University Applied Physics Laboratory, 11100 John Hopkins Road, Laurel, MD 20723-6099, USA.
Appl Opt. 2007 May 20;46(15):2838-50. doi: 10.1364/ao.46.002838.
A 3D scanner, based on incoherent illumination techniques, and associated data-processing algorithms are presented that can be used to scan objects at lateral resolutions ranging from 5 to 100 microm (or more) and depth resolutions of approximately 2 microm. The scanner was designed with the specific intent to scan cuneiform tablets but can be utilized for other applications. Photometric stereo techniques are used to obtain both a surface normal map and a parameterized model of the object's bidirectional reflectance distribution function. The normal map is combined with height information, gathered by structured light techniques, to form a consistent 3D surface. Data from Lambertian and specularly diffuse spherical objects are presented and used to quantify the accuracy of the techniques. Scans of a cuneiform tablet are also presented. All presented data are at a lateral resolution of 26.8 microm as this is approximately the minimum resolution deemed necessary to accurately represent cuneiform.
本文介绍了一种基于非相干照明技术的3D扫描仪及相关数据处理算法，该扫描仪可用于扫描横向分辨率在5至100微米（或更高）、深度分辨率约为2微米的物体。该扫描仪专为扫描楔形文字泥板而设计，但也可用于其他应用。采用光度立体技术获取物体双向反射分布函数的表面法线图和参数化模型。法线图与通过结构光技术收集的高度信息相结合，形成一个一致的3D表面。展示了来自朗伯体和镜面漫反射球形物体的数据，并用于量化这些技术的准确性。还展示了楔形文字泥板的扫描结果。所有展示的数据横向分辨率均为26.8微米，因为这大约是准确呈现楔形文字所需的最低分辨率。
