PS $^{2}$ F: Polarized Spiral Point Spread Function for Single-Shot 3D Sensing
PS $^{2}$ F: Polarized Spiral Point Spread Function for Single-Shot 3D Sensing
复制标题
PS $^{2}$ F：用于单次 3D 传感的偏振螺旋点扩展函数
DOI：
10.1109/tpami.2022.3202511
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发表时间：
2022
影响因子：
23.6
通讯作者：
Veeraraghavan, Ashok
中科院分区：
文献类型：
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作者：
Ghanekar, Bhargav;Saragadam, Vishwanath;Mehra, Dushyant;Gustavsson, Anna-Karin;Sankaranarayanan, Aswin C.;Veeraraghavan, Ashok
我们提出了一种依赖于工程点扩散函数（PSF）的紧凑快照单目深度估计技术。显微超分辨率成像中使用的传统方法，例如双螺旋 PSF (DHPSF)，不适合比稀疏点光源集更复杂的场景。我们使用 Cramér-Rao 下界证明，将 DHPSF 的两个波瓣分开，从而捕获两个单独的图像，可以显着提高深度精度。用于生成 DHPSF 的相位掩模的特殊属性是将相位掩模分成两半导致两个波瓣的空间分离。我们利用这一特性构建了一个紧凑的基于偏振的光学装置，在 DHPSF 相位掩模的每一半上放置两个正交线性偏振器，然后使用偏振敏感相机捕获生成的图像。模拟和实验室原型的结果表明，与 DHPSF 和 Tetrapod PSF 等最先进的设计相比，我们的技术实现了更低的深度误差，并且空间分辨率几乎没有损失。
We propose a compact snapshot monocular depth estimation technique that relies on an engineered point spread function (PSF). Traditional approaches used in microscopic super-resolution imaging such as the Double-Helix PSF (DHPSF) are ill-suited for scenes that are more complex than a sparse set of point light sources. We show, using the Cramér-Rao lower bound, that separating the two lobes of the DHPSF and thereby capturing two separate images leads to a dramatic increase in depth accuracy. A special property of the phase mask used for generating the DHPSF is that a separation of the phase mask into two halves leads to a spatial separation of the two lobes. We leverage this property to build a compact polarization-based optical setup, where we place two orthogonal linear polarizers on each half of the DHPSF phase mask and then capture the resulting image with a polarization-sensitive camera. Results from simulations and a lab prototype demonstrate that our technique achieves up tolower depth error compared to state-of-the-art designs including the DHPSF and the Tetrapod PSF, with little to no loss in spatial resolution.