New Reflection Transformation Imaging Methods for Rock Art and Multiple-Viewpoint Display
New Reflection Transformation Imaging Methods for Rock Art and Multiple-Viewpoint Display
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岩画反射变换成像新方法及多视点显示
DOI：
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发表时间：
2006
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通讯作者：
M. Lum
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作者：
Mark Mudge;T. Malzbender;Carla Schroer;M. Lum
本文提出了两种利用反射变换成像（RTI）记录和传播文化遗产信息的新方法。一种成像方法能够获得具有大范围尺寸，形状和环境背景的3D岩石艺术的多项式纹理图（PTMs）。与现有的需要已知光源位置的PTM捕获方法不同，我们依靠用户定位手持光源，并从相机捕获的视场中包含的黑色球体上产生的镜面高光中恢复照明方向。这种获取方法简单、快速、成本极低、易学。还提出了一种从多个视点集成主题的数字RTI表示的补充方法。它允许RTI在一个统一的、交互式的、基于图像的表示中“全面”地进行检查。文化遗产成像、惠普实验室和联合国教科文组织位于葡萄牙科阿山谷的史前岩石艺术遗址（世界遗产）之间的合作测试表明，这种方法在现场和实验室中应用于各种大小的旧石器时代岩画时都是非常有益的。这些优于当前最佳实践标准的好处可以推广到广泛的文化遗产材料。
We offer two new methods of documenting and communicating cultural heritage information using Reflection Transformation Imaging (RTI). One imaging method is able to acquire Polynomial Texture Maps (PTMs) of 3D rock art possessing a large range of sizes, shapes, and environmental contexts. Unlike existing PTM capture methods requiring known light source positions, we rely on the user to position a handheld light source, and recover the lighting direction from the specular highlights produced on a black sphere included in the field of view captured by the camera. The acquisition method is simple, fast, very low cost, and easy to learn. A complementary method of integrating digital RTI representations of subjects from multiple viewpoints is also presented. It permits RTI examination "in the round" in a unified, interactive, image-based representation. Collaborative tests between Cultural Heritage Imaging, Hewlett- Packard Labs, and the UNESCO Prehistoric Rock-Art Sites in the Coa Valley, a World Heritage Site in Portugal, suggest this approach will be very beneficial when applied to paleolithic petroglyphs of various sizes, both in the field and in the laboratory. These benefits over current standards of best practice can be generalized to a broad range of cultural heritage material.