  Being able to see beyond the direct line of sight is an intriguing
prospective and could benefit a wide variety of important applications. Recent
work has demonstrated that time-resolved measurements of indirect diffuse light
contain valuable information for reconstructing shape and reflectance
properties of objects located around a corner. In this paper, we introduce a
novel reconstruction scheme that, by design, produces solutions that are
consistent with state-of-the-art physically-based rendering. Our method
combines an efficient forward model (a custom renderer for time-resolved
three-bounce indirect light transport) with an optimization framework to
reconstruct object geometry in an analysis-by-synthesis sense. We evaluate our
algorithm on a variety of synthetic and experimental input data, and show that
it gracefully handles uncooperative scenes with high levels of noise or
non-diffuse material reflectance.
