Wide-Baseline Light Fields using Ellipsoidal Mirrors
Wide-Baseline Light Fields using Ellipsoidal Mirrors
复制标题
使用椭圆面镜的宽基线光场
DOI：
10.1109/tpami.2022.3202513
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发表时间：
2022
影响因子：
23.6
通讯作者：
Sankaranarayanan, Aswin C.
中科院分区：
文献类型：
--
作者：
De Zeeuw, Michael;Sankaranarayanan, Aswin C.
传统的手持式光场相机仅观察场景点发出的光锥的一小部分。因此，研究有趣的角度效应，如虹彩，超出了这种相机的范围。本文设想了一种新的设计，用于感测宽基线的光场，以便感测场景点发出的光锥的显著更大的部分。我们的系统实现了这一点成像的场景，间接地，通过一个椭圆镜。我们发现，椭圆镜映射一个宽锥光从其焦点附近的位置在其另一个焦点的一个较窄的圆锥，因此，通过放置一个传统的光场相机的焦点，我们可以观察到一个宽基线的光场从现场附近的其他焦点。我们通过模拟和实验室原型表明，宽基线光场在涉及焦点和视角变化的传统应用中表现出色。此外，他们观察到的更大的光锥允许研究彩虹色和薄膜干涉。也许令人惊讶的是，更大的光锥允许我们通过推理场景点的可见性来估计场景点的表面法线。
Traditional hand-held light field cameras only observe a small fraction of the cone of light emitted by a scene point. As a consequence, the study of interesting angular effects like iridescence are beyond the scope of such cameras. This paper envisions a new design for sensing light fields with wide baselines, so as to sense a significantly larger fraction of the cone of light emitted by scene points. Our system achieves this by imaging the scene, indirectly, through an ellipsoidal mirror. We show that an ellipsoidal mirror maps a wide cone of light from locations near one of its foci to a narrower cone at its other focus; thus, by placing a conventional light field camera at a focus, we can observe a wide-baseline light field from the scene near the other focus. We show via simulations and a lab prototype that wide-baseline light fields excel in the traditional applications involving changes in focus and perspective. Additionally, the larger cone of light that they observe allows the study of iridescence and thin-film interference. Perhaps surprisingly, the larger cone of light allows us to estimate surface normals of scene points by reasoning about their visibility.