Introducing polarization into transient imaging improves depth estimation in participating media, by discriminating reflective from scattered light transport, and calculating depth from the former component only. Previous works have leveraged this approach, under the assumption of uniform polarization properties. However, the orientation and intensity of polarization inside scattering media is non-uniform, both in the spatial and temporal domains. As a result of this simplifying assumption, the accuracy of the estimated depth worsens significantly as the optical thickness of the medium increases. In this letter, we introduce a novel adaptive polarization-difference method for transient imaging, taking into account the nonuniform nature of polarization in scattering media. Our results demonstrate a superior performance for impulse-based transient imaging over previous unpolarized or uniform approaches.



@Article{Wu2018adaptive, Title = {Adaptive Polarization-Difference Transient Imaging for Depth Estimation in Scattering Media}, Author = {Rihui Wu and Adrian Jarabo and Jinli Suo and Feng Dai and Yongdong Zhang and Qionghai Dai and Diego Gutierrez}, Journal = {Optics Letters}, Volume = {43} Number = {6}, Year = {2018}, }




This work is supported by the NSFC (Nos. 61327013, 61327902, 61631009, 61379084, 61402440), DARPA (REVEAL, HR0011-16-C-0025), the Spanish Ministerio de Economia y Competitividad (TIN2016-78753-P), and the European Research Council (ERC Consolidator grant: CHAMELEON project, grant agreement No. 682080).