Abstract
We present PartiCam, a training-free Particle filtering rooted method for improved Camera controlled video generation. Generating videos that follow a precisely specified camera trajectory remains challenging for large video diffusion models. Training-free approaches are backbone-agnostic and avoid the need to construct large camera-annotated datasets by steering pretrained models toward the desired camera motion at test time. This enables the generation of camera-controlled video data that can subsequently be used to train camera-conditioned video diffusion models. Existing sampling-based guidance approaches often suffer from unstable trajectories: they either explore too broadly and fail to respect the target camera motion or collapse early and lose visual diversity over time. We introduce a global-local refinement framework for diffusion reward guidance, enabling accurate and consistent camera control during video generation. Our method builds on Sequential Monte-Carlo (SMC) guidance, but introduces a local refinement stage based on particle filtered resampling. Experiments show large improvements in camera trajectory adherence, reduced drift, and better visual quality, without requiring model retraining.
Keywords
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Publication details
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- Open access
- Green open access
Cite this article
APA 7
Ouasfi, A., Li, R., Han, J., Marchand, E., Torr, P. H. S., & Boukhayma, A. (2026). PartiCam: Camera Controlled Video Generation with Reward Guidance. https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance
MLA 9
Ouasfi, Amine, et al. "PartiCam: Camera Controlled Video Generation with Reward Guidance." https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance.
Chicago (author–date)
Ouasfi, Amine, Runjia Li, Junlin Han, Eric Marchand, Philip H. S. Torr, and Adnane Boukhayma. 2026. "PartiCam: Camera Controlled Video Generation with Reward Guidance." https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance.
Harvard
Ouasfi, A., Li, R., Han, J., Marchand, E., Torr, P. H. S. and Boukhayma, A. (2026) 'PartiCam: Camera Controlled Video Generation with Reward Guidance', Available at: https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance.
Vancouver
Ouasfi A, Li R, Han J, Marchand E, Torr PHS, Boukhayma A. PartiCam: Camera Controlled Video Generation with Reward Guidance. https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance
IEEE
A. Ouasfi, R. Li, J. Han, E. Marchand, P. H. S. Torr, and A. Boukhayma, "PartiCam: Camera Controlled Video Generation with Reward Guidance," https://omanscience.com/en/articles/particam-camera-controlled-video-generation-with-reward-guidance.