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About this paper
Atul Ingle, Trevor Seets, Mauro Buttafava, Shantanu Gupta, Alberto Tosi, Mohit Gupta, Andreas Velten
Passive Inter-Photon Imaging (IP-SPAD) introduces a method leveraging picosecond-resolution single-photon avalanche diodes to measure inter-photon times as a continuous cue for scene brightness. This approach enables single-capture imaging with an experimentally demonstrated dynamic range exceeding ten million to one, preserving details from extremely dark to intensely bright scene regions where conventional and photon-counting SPAD cameras typically fail.
Key insights
- By exploiting the continuous nature of inter-photon timing, the IP-SPAD method significantly extends the usable flux range and reduces quantization noise compared to discrete photon-counting approaches, effectively mitigating soft-saturation.
- The temporal information embedded in photon arrival statistics provides a highly sensitive and robust signal for brightness estimation across an extremely wide illumination spectrum.
- Robust performance in practical hardware is achievable by addressing and calibrating for non-idealities such as dead-time drift, demonstrating the method's feasibility for real-world applications.
Summary by alphaXiv.
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