US Patent 9514378 Space-time modulated active 3D imager

Three-dimensional imagers have conventionally been constrained by size, weight, and power (“SWaP”) limitations, readout circuitry bottlenecks, and the inability to image in sunlit environments. As described herein, an imager can illuminate a scene with spatially and temporally modulated light comprising a viewpoint-invariant pattern. The imager can detect diffuse reflections from the illuminated scene to produce a first image. The first image is background-corrected and compared with respect to a known reference image to produce a depth image. The imager can perform in sunlit environments and has improved SWaP and signal-to-noise (SNR) characteristics over existing technologies.