SiM-SHDR: single-layer metasurface for snapshot high dynamic range imaging

Imaging systems based on metasurfaces have advantages in terms of integration and flexibility. Here, we present a single-layer metasurface for snapshot high dynamic range (HDR) Imaging scheme (SiMSHDR). The metasurface can integrate functions of multiple components found in traditional HDR imaging systems. Benefiting from the polarization-independent full-space amplitude and phase control mechanism, the single-layer metasurface is capable of capturing multiple high-fidelity images with different levels of intensity in a single shot. After fusing the images, the dynamic range of the pictures can be effectively extended. Using dual-channel image capture configuration with an intensity ratio of 10:1, the dynamic range can theoretically be enhanced by up to 20 dB. Experimental results in our demonstrated imaging system show the dynamic range improvement can reach 17.5 dB and even more. This metasurface design maintains a similar weight and volume to traditional single-image acquisition systems, making it ideal for lightweight, ultra-compact and real-time HDR imaging in applications like surveillance, industrial manufacturing, and driving.

基于超表面（metasurface）的成像系统在集成性与灵活性层面具备显著优势。本文提出一种面向快照式高动态范围（High Dynamic Range, HDR）成像方案的单层超表面（SiMSHDR）。该超表面可集成传统HDR成像系统中多个光学组件的功能。得益于偏振无关的全空间幅相调控机制，该单层超表面能够单次拍摄获取多幅不同光强等级的高保真图像。对上述图像进行融合后，可有效拓展图像的动态范围。采用光强比为10:1的双通道图像采集配置，理论上可将动态范围提升至多20 dB。本研究所搭建的演示成像系统的实验结果表明，动态范围提升量可达17.5 dB甚至更高。该超表面设计的重量与体积与传统单帧图像采集系统相近，非常适用于安防监控、工业制造、自动驾驶等场景下的轻量化、超紧凑且实时的HDR成像应用。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于单层超表面在快照高动态范围成像技术中的应用，展示了如何通过单层超表面实现多幅不同强度图像的高保真捕获和融合，从而有效扩展图像的动态范围。数据集由多个研究机构合作完成，包含1.68 GB的实验数据，得到了国家自然科学基金的资助。