Non-line-of-sight Imaging

Non-line-of-sight imaging based on wavefront shaping

Conventional non-line-of sight imaging relies on the time difference of the arriving photons to reconstruct the shape of the target that is hidden from the direct line-of-sight. Here, we are investigating whether we can correct the random wavefront modulation due to the scattering of the wall, and focus onto the hidden target. In an actual non-line-of-sight setting, prior manipulation on the target is infeasible. Thus, we need to use the target itself as the guidestar. We are investigating ways to control the light such that we can synthesize a much smaller focus when comparing with the target, which can be raster scanned to form an image later. The figure below illustrates the process of using small apertures to generate a large aperture.

Fig. 1: Concept of our system. The optimization steps are illustrated in a and b. Apply the phase masks optimized in a and b, we can get a much smaller focus.

More information will be available as we proceed.

Research: Non-line-of-sight imaging via wavefront shaping

Non-line-of-sight imaging based on wavefront shaping