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Transient imaging or light-in-flight techniques capture the propagation of anultra-short pulse of light through a scene, which in effect captures theoptical impulse response of the scene. Recently, it has been shown that we cancapture transient images using commercially available Time-of-Flight (ToF)systems such as Photonic Mixer Devices (PMD). In this paper, we propose`spatial phase-sweep', a technique that exploits the speed of light to increasethe temporal resolution beyond the 100 picosecond limit imposed by currentelectronics. Spatial phase-sweep uses a linear array of light sources withspatial separation of about 3 mm between them, thereby resulting in a timeshift of about 10 picoseconds, which translates into 100 Gfps of transientimaging in theory. We demonstrate a prototype and transient imaging resultsusing spatial phase-sweep.

Spatial Phase-Sweep: Increasing temporal resolution of transient imaging using a light source array