Recovering three-dimensional shape around a corner using ultrafast time-of-flight imaging
Recovering three-dimensional shape around a corner using ultrafast time-of-flight imaging
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DOI：
10.1038/ncomms1747
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发表时间：
2012-03-01
影响因子：
16.6
通讯作者：
Raskar, Ramesh
中科院分区：
文献类型：
--
作者：
Velten, Andreas;Willwacher, Thomas;Raskar, Ramesh
恢复被散射遮蔽的物体是成像中的一个重要目标，并且已经通过利用例如相干特性、弹道光子或穿透波长来实现。常见的方法是使用散射光透过遮挡材料，虽然这些失败，如果遮挡是不透明的。光的散射不仅通过物体的透射，而且通过场景中漫反射表面的多次反射。该反射光包含关于场景的信息，该信息在到达图像传感器之前被漫反射混合。这种混合很难使用传统相机解码。在这里，我们报告的飞行时间技术和计算重建算法的组合来解开混合漫反射的图像信息。我们展示了一个三维范围的相机，能够环顾四周的角落，使用漫反射光，实现亚毫米的深度精度和厘米的横向精度超过40 cmx40 cmx40 cm的隐藏空间。
The recovery of objects obscured by scattering is an important goal in imaging and has been approached by exploiting, for example, coherence properties, ballistic photons or penetrating wavelengths. Common methods use scattered light transmitted through an occluding material, although these fail if the occluder is opaque. Light is scattered not only by transmission through objects, but also by multiple reflection from diffuse surfaces in a scene. This reflected light contains information about the scene that becomes mixed by the diffuse reflections before reaching the image sensor. This mixing is difficult to decode using traditional cameras. Here we report the combination of a time-of-flight technique and computational reconstruction algorithms to untangle image information mixed by diffuse reflection. We demonstrate a three-dimensional range camera able to look around a corner using diffusely reflected light that achieves sub-millimetre depth precision and centimetre lateral precision over 40 cmx40 cmx40 cm of hidden space.