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The measurement rate of cameras that take spatially multiplexed measurementsby using spatial light modulators (SLM) is often limited by the switching speedof the SLMs. This is especially true for single-pixel cameras where thephotodetector operates at a rate that is many orders-of-magnitude greater thanthe SLM. We study the factors that determine the measurement rate for suchspatial multiplexing cameras (SMC) and show that increasing the number ofpixels in the device improves the measurement rate, but there is an optimumnumber of pixels (typically, few thousands) beyond which the measurement ratedoes not increase. This motivates the design of LiSens, a novel imagingarchitecture, that replaces the photodetector in the single-pixel camera with a1D linear array or a line-sensor. We illustrate the optical architectureunderlying LiSens, build a prototype, and demonstrate results of a range ofindoor and outdoor scenes. LiSens delivers on the promise of SMCs: imaging at amegapixel resolution, at video rate, using an inexpensive low-resolutionsensor.

LiSens --- A Scalable Architecture for Video Compressive Sensing