用两个普通镜头和一秒钟重建，实现高效高精度光谱成像
Spectrum from Defocus: Fast Spectral Imaging with Chromatic Focal Stack
- 通过色差焦堆捕捉全光量信息，结合物理模型快速重建
- 在低光下实现高时空谱分辨率，重建时间小于1秒
- 光学简单、效率高，适合便携式与实时应用
高光谱相机在低光条件下面临空间、光谱和时间分辨率的严峻权衡。计算成像系统虽能突破这些限制，但通常依赖复杂光学结构或大量计算。本文提出Spectrum from Defocus（SfD），一种基于色差焦堆的光谱成像方法，仅需两个市售镜头、一个灰度传感器，且重建时间不足1秒，即可实现当前最优的高光谱成像效果。该方法通过捕获保留几乎全部入射光的色差焦堆，并采用快速物理驱动的迭代算法进行重建，输出清晰准确的高光谱图像。其高光子利用率、光学简洁性及物理可解释性，使其成为快速、紧凑、可解释高光谱成像的理想方案。
原文摘要 · Abstract (English)
Hyperspectral cameras face harsh trade-offs between spatial, spectral, and temporal resolution in inherently low-photon conditions. Computational imaging systems break through these trade-offs with compressive sensing, but have required complex optics and/or extensive compute. We present Spectrum from Defocus (SfD), a chromatic focal sweep method that achieves state-of-the-art hyperspectral imaging with only two off-the-shelf lenses, a grayscale sensor, and less than one second of reconstruction time. By capturing a chromatically-aberrated focal stack that preserves nearly all incident light, and reconstructing it with a fast physics-based iterative algorithm, SfD delivers sharp, accurate hyperspectral images. The combination of photon efficiency, optical simplicity, and physical interpretability makes SfD a promising solution for fast, compact, interpretable hyperspectral imaging.
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