Dual photography
Dual photography
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DOI：
10.1145/1073204.1073257
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发表时间：
2005-07-01
影响因子：
6.2
通讯作者：
Lensch, HPA
中科院分区：
文献类型：
--
作者：
Sen, P;Chen, B;Lensch, HPA
我们提出了一种新的摄影技术，称为双重摄影，它利用亥姆霍兹互惠互换的灯光和相机在一个场景。通过视频投影仪提供结构化照明，互易性允许我们从投影仪的视角生成图片，即使在该位置没有摄像机。该技术是完全基于图像的，不需要场景几何或表面属性的知识，并且其性质自动包括所有传输路径，包括阴影，相互反射和焦散。在其最简单的形式中，该技术可以用于在没有相机的情况下拍摄照片;我们通过使用投影仪和光敏电阻器捕获照片来证明这一点。如果光敏电阻器被相机取代，我们可以产生一个4D数据集，允许用2D入射照明重新照明。使用相机阵列，我们可以产生8D反射场的6D切片，其允许用任意光场重新照明。由于相机阵列可以在没有干扰的情况下并行操作，而光源阵列则不能，因此双摄影从根本上说是一种比基于多个投影仪和一个相机的系统更有效的捕获这种6D数据集的方法。作为一个例子，我们展示了如何双重摄影可以用来捕捉和重新照明的场景。
We present a novel photographic technique called dual photography, which exploits Helmholtz reciprocity to interchange the lights and cameras in a scene. With a video projector providing structured illumination, reciprocity permits us to generate pictures from the viewpoint of the projector, even though no camera was present at that location. The technique is completely image-based, requiring no knowledge of scene geometry or surface properties, and by its nature automatically includes all transport paths, including shadows, inter-reflections and caustics. In its simplest form, the technique can be used to take photographs without a camera; we demonstrate this by capturing a photograph using a projector and a photo-resistor. If the photo-resistor is replaced by a camera, we can produce a 4D dataset that allows for relighting with 2D incident illumination. Using an array of cameras we can produce a 6D slice of the 8D reflectance field that allows for relighting with arbitrary light fields. Since an array of cameras can operate in parallel without interference, whereas an array of light sources cannot, dual photography is fundamentally a more efficient way to capture such a 6D dataset than a system based on multiple projectors and one camera. As an example, we show how dual photography can be used to capture and relight scenes.