用超表面实现一帧图像同时捕捉近距和远距成像，支持毫米级测距。
Compact single-shot ranging and near-far imaging using metasurfaces
- 通过超表面设计实现单次曝光下多焦点成像。
- 在1.4~2.0厘米处形成焦堆，12~20毫米范围测距精度达±1毫米。
- 系统仅15毫米厚，适合嵌入边缘设备，如安防与便携装备。
我们提出一种超表面成像系统，能够在同一张感光芯片上同时捕获近距离（1-2厘米）和远距离（约40厘米）的图像。近距离成像聚焦于1.4厘米和2.0厘米，构成焦堆，通过计算高效的基于模糊深度算法，在12~20毫米范围内实现±1毫米的被动测距精度。整个系统总长度仅为15毫米，结构紧凑，适用于国防及其他资源受限场景的边缘平台无缝集成。
原文摘要 · Abstract (English)
We present a metasurface imaging system capable of simultaneously capturing two images at close range (1-2~cm) and an additional image at long range (about 40~cm) on a shared photosensor. The close-range image pair focuses at 1.4~cm and 2.0~cm, respectively, which forms a focal stack, enabling passive ranging with an accuracy of $\pm$1~mm from 12~mm to 20~mm through a computationally efficient depth-from-defocus algorithm for a simplified scenario. The entire system is compact, with a total track length of 15~mm, making it suitable for seamless integration into edge platforms for defense and other resource-constrained applications.
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