Infinite-Homography as Robust Conditioning for Camera-Controlled Video Generation

TL;DR

InfCam introduces a novel depth-free video generation framework that uses infinite homography warping and data augmentation to achieve high-fidelity, camera-controlled video synthesis with diverse trajectories, outperforming existing methods.

Contribution

The paper proposes InfCam, a depth-free, camera-controlled video generation method that encodes 3D rotations in 2D latent space and enhances data diversity, improving pose fidelity and visual quality.

Findings

Outperforms baseline methods in camera-pose accuracy

Generalizes well from synthetic to real-world data

Achieves high visual fidelity in generated videos

Abstract

Recent progress in video diffusion models has spurred growing interest in camera-controlled novel-view video generation for dynamic scenes, aiming to provide creators with cinematic camera control capabilities in post-production. A key challenge in camera-controlled video generation is ensuring fidelity to the specified camera pose, while maintaining view consistency and reasoning about occluded geometry from limited observations. To address this, existing methods either train trajectory-conditioned video generation model on trajectory-video pair dataset, or estimate depth from the input video to reproject it along a target trajectory and generate the unprojected regions. Nevertheless, existing methods struggle to generate camera-pose-faithful, high-quality videos for two main reasons: (1) reprojection-based approaches are highly susceptible to errors caused by inaccurate depth estimation; and (2) the limited diversity of camera trajectories in existing datasets restricts learned models. To address these limitations, we present InfCam, a depth-free, camera-controlled video-to-video generation framework with high pose fidelity. The framework integrates two key components: (1) infinite homography warping, which encodes 3D camera rotations directly within the 2D latent space of a video diffusion model. Conditioning on this noise-free rotational information, the residual parallax term is predicted through end-to-end training to achieve high camera-pose fidelity; and (2) a data augmentation pipeline that transforms existing synthetic multiview datasets into sequences with diverse trajectories and focal lengths. Experimental results demonstrate that InfCam outperforms baseline methods in camera-pose accuracy and visual fidelity, generalizing well from synthetic to real-world data. Link to our project page:https://emjay73.github.io/InfCam/