Bringing VLC into ToF imaging: Pseudo-Passive Indoor ToF Imaging

High power consumption is a fundamental problem in active Timeof-Flight (ToF) modalities in contrast with passive imaging modalities, particularly when the ToF camera is incorporated into low-power devices, i.e., smartphones. This work introduces a novel concept that provides ToF-based measurements of a scene by empowering the light-based communication infrastructure in bistatic configuration. This provides a potential platform due to the pervasive presence of modulated light sources in indoor infrastructure. In this context, we are attempting to use VLC infrastructure, which synergistically supports lighting and communication, as an opportunity illuminator to attain ToF sensing for free. Such capabilities are demonstrated by performing simulations based on continuous-wave (CW) ToF and pulse-based (PB) ToF sensing in a passive approach. The passive modality not only makes the need for illumination units futile in ToF cameras, but also, consequently, will reduce the power consumption and cost of the system.