Lite2Relight: 3D-aware Single Image Portrait Relighting

Abstract

Achieving photorealistic 3D view synthesis and relighting of human portraits is pivotal for advancing AR/VR applications. Existing methodologies in portrait relighting encounter substantial limitations in terms of generalization and 3D consistency, coupled with inaccuracies in physically realistic lighting and identity preservation. Furthermore, personalization from a single view is difficult to achieve and often requires multiview images during the testing phase or involves slow optimization processes. This paper introduces Lite2Relight , a novel technique that can predict 3D consistent head poses of portraits while performing physically plausible light editing at interactive speed. Our method uniquely extends the generative capabilities and efficient volumetric representation of EG3D, leveraging a lightstage dataset to implicitly disentangle face reflectance and perform relighting under target HDRI environment maps. By utilizing a pre-trained geometry-aware encoder and a feature alignment module, we map input images into a relightable 3D space, enhancing them with a strong face geometry and reflectance prior. Through extensive quantitative and qualitative evaluations, our method outperforms the state-of-the-art methods in terms of efficacy, photorealism, and practical application. This includes producing 3D-consistent results of the full head, including hair, eyes, and expressions. Lite2Relight paves the way for large-scale adoption of photorealistic portrait editing in various domains, offering a robust, interactive solution to a previously constrained problem.

Citation Style:    Display Alpha ACM SIGGRAPH IEEEtran Publication

Lite2Relight: 3D-aware Single Image Portrait Relighting. Pramod Rao, Gereon Fox, Abhimitra Meka, Mallikarjun B R, Fangneng Zhan, Tim Weyrich, Bernd Bickel, Hanspeter Pfister, Wojciech Matusik, Mohamed Elgharib, Christian Theobalt. SIGGRAPH 2024 Conference Papers, to appear, July 2024.Pramod Rao, Gereon Fox, Abhimitra Meka, Mallikarjun B R, Fangneng Zhan, Tim Weyrich, Bernd Bickel, Hanspeter Pfister, Wojciech Matusik, Mohamed Elgharib, and Christian Theobalt. Lite2relight: 3d-aware single image portrait relighting. In SIGGRAPH Conference Papers, New York, NY, USA, July 2024. Association for Computing Machinery.Rao, P., Fox, G., Meka, A., B R, M., Zhan, F., Weyrich, T., Bickel, B., Pfister, H., Matusik, W., Elgharib, M., and Theobalt, C. 2024. Lite2relight: 3d-aware single image portrait relighting. InSIGGRAPH Conference Papers, Association for Computing Machinery, New York, NY, USA.P. Rao, G. Fox, A. Meka, M. B R, F. Zhan, T. Weyrich, B. Bickel, H. Pfister, W. Matusik, M. Elgharib, and C. Theobalt, “Lite2relight: 3d-aware single image portrait relighting,” in SIGGRAPH Conference Papers. New York, NY, USA: Association for Computing Machinery, Jul. 2024. PDF (57 MB) Low-res PDF (2.5 MB) Suppl. Material (31 MB) Source Code External Project Page BibTeX

Acknowledgments

This work was supported by the ERC Consolidator Grant 4DReply (770784). We extend our gratitude to Shrisha Bharadwaj for providing feedback and constant support.