Flexible Motion Stylization via Multi-modality Latent Diffusion Model.
Multi-modality motion stylization presents a solution to the challenge of generating flexible, stylized motion based on multimodal style inputs. Historically, motion stylization has grappled with the difficulty of balancing content and style, often prioritizing one at the expense of the other. This paper addresses the complex challenge of multi-modality content-style duality, achieving a sophisticated integration that both preserves and enhances the core narrative through nuanced stylistic modifications. We propose a Multi-modality Latent Diffusion Model (MM-LDM), a novel framework that leverages diffusion models under multi-modality conditions, including motion style (text-based or motion-based), motion content, and motion trajectory components. A central innovation in our approach is the introduction of a Multi-condition Denoiser, which carefully balances the preservation of primary content with the dynamic integration of style and trajectory as secondary conditions. This multi-modality guidance mechanism, implemented during the denoising process, ensures that new styles are seamlessly integrated with the original content. It gives rise to more authentic and cohesive motion stylization outcomes, establishing a new benchmark in computer animation. To further refine the control over the text-based motion style, we introduce an LLM parser that converts broad motion descriptions into detailed, part-specific representations. By decomposing the human body into movement-related parts, our method significantly enhances the precision and effectiveness of text-based motion stylization, enabling fine-grained control over individual body parts. Our model's effectiveness and generalization capabilities have been rigorously validated through extensive experiments, including text-based motion stylization and generating stylized motion with video sources, which all demonstrate the potential of our MM-LDM to advance the state-of-the-art motion stylization.