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Causally Steered Diffusion for Automated Video Counterfactual Generation

작성자
  • Haebom

Author

Nikos Spyrou, Athanasios Vlontzos, Paraskevas Pegios, Thomas Melistas, Nefeli Gkouti, Yannis Panagakis, Giorgos Papanastasiou, Sotirios A. Tsaftaris

Outline

This paper proposes CSVC, a novel framework for causally informed video editing. While existing research on applying the text-to-image (T2I) latent diffusion model (LDM) to video editing has demonstrated excellent visual fidelity and controllability, it struggles to maintain causal relationships in the video data generation process. CSVC formulates counterfactual video generation as an externally distributed (OOD) prediction problem, considering causal relationships. It encodes relationships specified in the causal graph into text prompts to incorporate prior causal knowledge and guides the generation process by optimizing the prompts using a visual-language model (VLM)-based text loss. This ensures that the LDM's latent space captures counterfactual variations, leading to the generation of causally meaningful alternatives. CSVC is independent of the underlying video editing system and operates without any internal mechanisms or fine-tuning. Experimental results demonstrate that CSVC generates causally faithful counterfactual video results within the LDM distribution through prompt-based causal adjustment, achieving state-of-the-art causality without compromising temporal consistency or visual quality. Because it is compatible with any dashcam video editing system, it has significant potential for creating realistic 'what if' video scenarios in a variety of fields, such as digital media and healthcare.

Takeaways, Limitations

Takeaways:
A new framework for causal video editing (CSVC) is presented.
Solving the problem of maintaining causality in existing LDM-based video editing.
Achieving cutting-edge causal effects through prompt-based causal coordination.
Maintain temporal consistency and visual quality.
Compatibility with black box video editing systems.
Applicability in various fields such as digital media and medicine.
Limitations:
The accuracy of the causal graph design may affect the results.
Applicability to images with complex causal relationships needs to be reviewed.
There are aspects that depend on VLM performance.
Further experiments using larger datasets are needed.
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