Schematic of our compressive transient imaging system.
Time-of-flight depth imaging and transient imaging are two imaging
modalities that have recently received a lot of interest. Despite
much research, existing hardware systems are limited either in terms
of temporal resolution or are prohibitively expensive. Arrays of
Single Photon Avalanche Diodes (SPADs) promise to fill this gap by
providing higher temporal resolution at an affordable
cost. Unfortunately SPAD arrays are to date only available in
relatively small resolutions.
In this work we aim to overcome the spatial resolution limit of SPAD
arrays by employing a compressive sensing camera design. Using a DMD
and custom optics, we achieve an image resolution of up to
800×400 on SPAD Arrays of resolution 64×32. Using our
new data fitting model for the time histograms, we suppress the
noise while abstracting the phase and amplitude information, so as
to realize a temporal resolution of a few tens of picoseconds.
Experimental reconstructed depth image and intensity image. Scale bar:10mm