Speaker：Bailin Deng (Cardiff University)

Time：2023-11-14 10:00

Location：Conference Room 105 at Experiment Building at Haiyun Campus

Abstract:

Designing a freeform surface to reflect or refract light to achieve a target distribution is a challenging inverse problem. In this talk, I will present an end-to-end optimization strategy for such an optical surface. Our formulation leverages a novel differentiable rendering model, and is directly driven by the difference between the resulting light distribution and the target distribution.

To avoid local minima, we also formulate a face-based optimal transport between the current distribution and the target distribution, to induce large effective changes to the surface shape. By combining our OT update and rendering guided optimization in an iterative manner, our method can produce lens designs with a resulting image that closely resembles the target. The effectiveness of our algorithm is demonstrated using both simulation and physical prototypes.