Imagine360: Immersive 360 Video Generation from Perspective Anchor
Authors: name: Jing Tan, name: Shuai Yang, name: Tong Wu, name: Jingwen He, name: Yuwei Guo, name: Ziwei Liu, name: Dahua Lin

360^circ videos offer a hyper-immersive experience that allows the viewers
to explore a dynamic scene from full 360 degrees. To achieve more user-friendly
and personalized content creation in 360^circ video format, we seek to lift
standard perspective videos into 360^circ equirectangular videos. To this
end, we introduce Imagine360, the first perspective-to-360^circ video
generation framework that creates high-quality 360^circ videos with rich and
diverse motion patterns from video anchors. Imagine360 learns fine-grained
spherical visual and motion patterns from limited 360^circ video data with
several key designs. 1) Firstly we adopt the dual-branch design, including a
perspective and a panorama video denoising branch to provide local and global
constraints for 360^circ video generation, with motion module and spatial
LoRA layers fine-tuned on extended web 360^circ videos. 2) Additionally, an
antipodal mask is devised to capture long-range motion dependencies, enhancing
the reversed camera motion between antipodal pixels across hemispheres. 3) To
handle diverse perspective video inputs, we propose elevation-aware designs
that adapt to varying video masking due to changing elevations across frames.
Extensive experiments show Imagine360 achieves superior graphics quality and
motion coherence among state-of-the-art 360^circ video generation methods.
We believe Imagine360 holds promise for advancing personalized, immersive
360^circ video creation.