Reproduce “Cascaded Non-Line-of-Sight Imaging” on OpenResearch
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About this paper
Diego Royo, María Peña, Forrest B. Peterson, Andreas Velten, Julio Marco, Diego Gutierrez
Cascaded Non-Line-of-Sight Imaging turns higher-order light transport into additional virtual viewpoints rather than treating it solely as multipath noise. By computationally propagating a single transient capture to hidden secondary walls, the method reconstructs fourth- and fifth-bounce scenes, recovering poorly oriented targets and objects around two corners; in simulation, combining virtual views reduced depth RMSE from 3.5 cm to 2.9 cm, while a prototype localized targets that conventional three-bounce imaging missed.
Key insights
- Higher-order photons can encode useful spatial information: approximately 2.5% fifth-bounce signal was sufficient to recover a hidden object in simulation.
- Virtual relay walls convert a complex higher-order transport problem into a sequence of ordinary three-bounce imaging problems, enabling existing phasor-field tools to be reused.
- Secondary-wall roughness improves angular coverage by promoting diffuse virtual scattering, but introduces speckle and a resolution trade-off; current virtual impulse responses provide roughly 20–40 cm spatial resolution.
Summary by alphaXiv.
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