Lumosaic: Hyperspectral Video via Active Illumination and Coded-Exposure Pixels

TL;DR

Lumosaic is a real-time hyperspectral video system that uses active illumination and coded exposure to improve spectral fidelity and temporal stability in dynamic scenes, outperforming passive snapshot methods.

Contribution

The paper introduces Lumosaic, a novel system combining active LED illumination with coded-exposure pixels for high-speed hyperspectral video capture and reconstruction.

Findings

Achieves 31-channel hyperspectral video at 30 fps and VGA resolution.

Significantly improves reconstruction fidelity over passive snapshot systems.

Demonstrates robustness across various materials and motion conditions.

Abstract

We present Lumosaic, a compact active hyperspectral video system designed for real-time capture of dynamic scenes. Our approach combines a narrowband LED array with a coded-exposure-pixel (CEP) camera capable of high-speed, per-pixel exposure control, enabling joint encoding of scene information across space, time, and wavelength within each video frame. Unlike passive snapshot systems that divide light across multiple spectral channels simultaneously and assume no motion during a frame's exposure, Lumosaic actively synchronizes illumination and pixel-wise exposure, improving photon utilization and preserving spectral fidelity under motion. A learning-based reconstruction pipeline then recovers 31-channel hyperspectral (400-700 nm) video at 30 fps and VGA resolution, producing temporally coherent and spectrally accurate reconstructions. Experiments on synthetic and real data demonstrate that Lumosaic significantly improves reconstruction fidelity and temporal stability over existing snapshot hyperspectral imaging systems, enabling robust hyperspectral video across diverse materials and motion conditions.