  Non-line-of-sight (NLOS) imaging relies on collecting light that is rendered
incoherent from the multiple scattering events and is then post-processed to
provide an estimate of the hidden scene. Here we employ coherent phase control
of the outgoing laser beam phase front so as to refocus the beam behind the
obscuring obstacle and then use the speckle memory effect to scan the focused
spot across the scene. The back-reflected light intensity provides a direct
measurement of the scene with a signal-to-noise ratio that is greatly improved
when measured using a temporally gated detector. A spatial resolution of less
than 1 mm is demonstrated, opening the way to high-resolution NLOS imaging.
