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arXiv 2507.05092cs.CV

MoDiT:利用扩散Transformer学习高度一致的3D运动系数以实现说话头生成

MoDiT: Learning Highly Consistent 3D Motion Coefficients with Diffusion Transformer for Talking Head Generation

The Hong Kong University of Science and Technology(香港科学与技术大学)

Yucheng Wang, Dan Xu

AI总结:

MoDiT提出结合3DMM与扩散Transformer的说话头生成框架,通过分层去噪、3D系数约束和改进眨眼策略解决时间抖动、身份漂移与眨眼不自然问题。

摘要:

音频驱动的说话头生成对于虚拟助手、视频游戏和电影等应用至关重要,其中自然的唇部运动不可或缺。尽管该领域已取得进展,但在生成一致且逼真的面部动画方面仍面临挑战。现有方法通常基于GAN或基于UNet的扩散模型,存在三大局限:(i)由于时间约束较弱导致的时间抖动,造成帧间不一致;(ii)由于3D信息提取不足导致的身份漂移,造成面部身份保持不佳;(iii)由于对真实眨眼动态建模不足导致的不自然眨眼行为。为解决这些问题,我们提出MoDiT,一个将3D形变模型(3DMM)与基于扩散的Transformer相结合的新框架。我们的贡献包括:(i)一种分层去噪策略,采用修正的时间注意力和偏置的自注意力/交叉注意力机制,使模型能够优化唇音同步并逐步增强全脸一致性,有效缓解时间抖动。(ii)集成3DMM系数以提供显式空间约束,确保准确的3D信息光流预测,并利用Wav2Lip结果改进唇音同步,从而保持身份一致性。(iii)一种改进的眨眼策略,用于建模自然眼部运动,实现更平滑、更逼真的眨眼行为。

英文摘要:

Audio-driven talking head generation is critical for applications such as virtual assistants, video games, and films, where natural lip movements are essential. Despite progress in this field, challenges remain in producing both consistent and realistic facial animations. Existing methods, often based on GANs or UNet-based diffusion models, face three major limitations: (i) temporal jittering caused by weak temporal constraints, resulting in frame inconsistencies; (ii) identity drift due to insufficient 3D information extraction, leading to poor preservation of facial identity; and (iii) unnatural blinking behavior due to inadequate modeling of realistic blink dynamics. To address these issues, we propose MoDiT, a novel framework that combines the 3D Morphable Model (3DMM) with a Diffusion-based Transformer. Our contributions include: (i) A hierarchical denoising strategy with revised temporal attention and biased self/cross-attention mechanisms, enabling the model to refine lip synchronization and progressively enhance full-face coherence, effectively mitigating temporal jittering. (ii) The integration of 3DMM coefficients to provide explicit spatial constraints, ensuring accurate 3D-informed optical flow prediction and improved lip synchronization using Wav2Lip results, thereby preserving identity consistency. (iii) A refined blinking strategy to model natural eye movements, with smoother and more realistic blinking behaviors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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