Passive Inter-Photon Imaging
- URL: http://arxiv.org/abs/2104.00059v1
- Date: Wed, 31 Mar 2021 18:44:52 GMT
- Title: Passive Inter-Photon Imaging
- Authors: Atul Ingle, Trevor Seets, Mauro Buttafava, Shantanu Gupta, Alberto
Tosi, Mohit Gupta, Andreas Velten
- Abstract summary: Digital camera pixels measure image intensities by converting incident light energy into an analog electrical current, and then digitizing it into a fixed-width binary representation.
This direct measurement method suffers from limited dynamic range and poor performance under extreme illumination.
We propose a novel intensity cue based on measuring inter-photon timing, defined as the time delay between detection of successive photons.
- Score: 18.739224941453983
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Digital camera pixels measure image intensities by converting incident light
energy into an analog electrical current, and then digitizing it into a
fixed-width binary representation. This direct measurement method, while
conceptually simple, suffers from limited dynamic range and poor performance
under extreme illumination -- electronic noise dominates under low
illumination, and pixel full-well capacity results in saturation under bright
illumination. We propose a novel intensity cue based on measuring inter-photon
timing, defined as the time delay between detection of successive photons.
Based on the statistics of inter-photon times measured by a time-resolved
single-photon sensor, we develop theory and algorithms for a scene brightness
estimator which works over extreme dynamic range; we experimentally demonstrate
imaging scenes with a dynamic range of over ten million to one. The proposed
techniques, aided by the emergence of single-photon sensors such as
single-photon avalanche diodes (SPADs) with picosecond timing resolution, will
have implications for a wide range of imaging applications: robotics, consumer
photography, astronomy, microscopy and biomedical imaging.
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