Krzesłowski Jakub, Sitnik Robert, Maczkowski Grzegorz
Institute of Micromechanics and Photonics, Warsaw University of Technology, Warsaw, Poland.
Appl Opt. 2011 Feb 1;50(4):532-41. doi: 10.1364/AO.50.000532.
Creating accurate three-dimensional (3D) digitalized models of cultural heritage objects requires that information about surface geometry be integrated with measurements of other material properties like color and reflectance. Up until now, these measurements have been performed in laboratories using manually integrated (subjective) data analyses. We describe an out-of-laboratory bidirectional reflectance distribution function (BRDF) and 3D shape measurement system that implements shape and BRDF measurement in a single setup with BRDF uncertainty evaluation. The setup aligns spatial data with the angular reflectance distribution, yielding a better estimation of the surface's reflective properties by integrating these two modality measurements into one setup using a single detector. This approach provides a better picture of an object's intrinsic material features, which in turn produces a higher-quality digitalized model reconstruction. Furthermore, this system simplifies the data processing by combining structured light projection and photometric stereo. The results of our method of data analysis describe the diffusive and specular attributes corresponding to every measured geometric point and can be used to render intricate 3D models in an arbitrarily illuminated scene.
创建文化遗产对象的精确三维（3D）数字化模型需要将表面几何信息与颜色和反射率等其他材料属性的测量结果相结合。到目前为止，这些测量都是在实验室中使用手动整合（主观）数据分析来进行的。我们描述了一种实验室外双向反射分布函数（BRDF）和三维形状测量系统，该系统在单个设置中实现形状和BRDF测量，并进行BRDF不确定性评估。该设置将空间数据与角反射率分布对齐，通过使用单个探测器将这两种模态测量整合到一个设置中，从而更好地估计表面的反射特性。这种方法能更清晰地呈现物体的固有材料特征，进而生成更高质量的数字化模型重建。此外，该系统通过结合结构光投影和光度立体视觉简化了数据处理。我们的数据分析方法的结果描述了与每个测量几何点对应的漫反射和镜面反射属性，可用于在任意光照场景中渲染复杂的三维模型。
