Dappled photography: Mask enhanced cameras for heterodyned light fields and coded aperture refocusing
Dappled photography: Mask enhanced cameras for heterodyned light fields and coded aperture refocusing
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DOI：
10.1145/1239451.1239520
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发表时间：
2007-07-01
影响因子：
6.2
通讯作者：
Tumblin, Jack
中科院分区：
文献类型：
--
作者：
Veeraraghavan, Ashok;Raskar, Ramesh;Tumblin, Jack
我们描述了一种在基于镜头的相机的光路中使用衰减掩模来可逆调制4D光场的理论框架。基于这个框架，我们提出了一种新的设计，可以从2D摄像机图像重建4D光场，而不需要像以前的光场摄像机那样增加任何附加的折射元件。有图案的掩模会衰减相机内部的光线，而不是弯曲光线，并且衰减可以对2D传感器上的光线进行可恢复的编码。我们配备掩膜的相机与传统相机一样，可以在全传感器分辨率下捕捉传统的2D照片，但原始像素值也保持着调制的4D光场。通过将传感器数值的2D傅里叶变换的瓦片重新排列到4D平面，并计算傅里叶逆变换，可以恢复光场。此外，我们还可以恢复场景中聚焦部分的全分辨率图像信息。我们还展示了如何在镜头处放置宽带掩模，使我们能够计算分层朗伯场景的全传感器分辨率的重聚焦图像。这种4D光线空间数据的部分编码允许按深度编辑图像内容，但不需要计算恢复整个4D光场。
We describe a theoretical framework for reversibly modulating 4D light fields using an attenuating mask in the optical path of a lens based camera. Based on this framework, we present a novel design to reconstruct the 4D light field from a 2D camera image without any additional refractive elements as required by previous light field cameras. The patterned mask attenuates light rays inside the camera instead of bending them, and the attenuation recoverably encodes the rays on the 2D sensor. Our mask-equipped camera focuses just as a traditional camera to capture conventional 2D photos at full sensor resolution, but the raw pixel values also hold a modulated 4D light field. The light field can be recovered by rearranging the tiles of the 2D Fourier transform of sensor values into 4D planes, and computing the inverse Fourier transform. In addition, one can also recover the full resolution image information for the in-focus parts of the scene.We also show how a broadband mask placed at the lens enables us to Compute refocused images at full sensor resolution for layered Lambertian scenes. This partial encoding of 4D ray-space data enables editing of image contents by depth, yet does not require computational recovery of the complete 4D light field.