Focal Sweep Camera for Space-Time Refocusing
Focal Sweep Camera for Space-Time Refocusing
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DOI：
10.7916/d8v69szb
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Changyin Zhou;Daniel Miau;S. Nayar
中科院分区：
文献类型：
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作者：
Changyin Zhou;Daniel Miau;S. Nayar
在本文中，我们提出了一种成像系统，1捕获的图像序列在场景中的焦点是扫描2在一个大的深度范围。我们将其称为时空焦点3堆栈，并提出了传感器分辨率下时空图像重新聚焦的算法-当用户点击像素时，我们5向用户显示在像素最佳聚焦时捕获的图像。7我们首先描述如何使焦点扫描8与图像捕获同步，使得焦点堆栈的总景深9有效地覆盖整个深度范围，而没有间隙或重叠。然后，我们提出了一个有效的算法11计算空间-时间聚焦索引映射从fo 12 cal堆栈。它规定了每个像素最佳聚焦的时间13，并且该算法被专门设计为即使在无纹理区域或深度不连续处也能实现无缝14的重新聚焦体验。我们实现了两个原型相机16时代，以捕捉大量的时空焦点堆栈，17并在www.focalsweep.com上在线提供交互式重新聚焦查看器。19
In this paper, we present an imaging system that 1 captures a sequence of images in a scene as focus is swept 2 over a large depth range. We refer to it as a space-time focal 3 stack and propose algorithms for space-time image refocus4 ing at sensor resolution – when a user clicks on a pixel, we 5 show the user the image that was captured at the time when 6 the pixel is best focused. 7 We first describe how to synchronize focus sweeping 8 with image capturing so that the summed depth of field of 9 a focal stack efficiently covers the entire depth range with10 out gaps or overlap. We then propose an efficient algorithm 11 for computing a space-time in-focus index map from a fo12 cal stack. It states which time each pixel is best focused 13 and the algorithm is specifically designed to enable a seam14 less refocusing experience, even in textureless regions or at 15 depth discontinuities. We implemented two prototype cam16 eras to capture a large number of space-time focal stacks, 17 and made an interactive refocusing viewer available online 18 at www.focalsweep.com. 19