Title: JDM: Joint Distribution Modeling for Fine-Grained Text-to-Video Generation
Primary area: generative models
Keywords: Diffusion Model, Video Generation

Abstract: Text-to-video (T2V) generation enables AI systems to create videos from textual descriptions, with applications in entertainment, education, and content creation. Recent advances in video diffusion models have improved visual quality, yet they struggle with fine-grained text-video alignment, often leading to attribute mismatches, incorrect object interactions, and compositional failures. In this paper, we identify that this limitation stem from a predominant focus on video reconstruction rather than explicitly learning structured text-video correspondences. To address this, we propose Joint Distribution Modeling (JDM), a novel framework that enhances fine-grained alignment by modeling the joint distribution of video content and object masks. Unlike prior methods that rely on external constraints, JDM inherently learns structured mappings between textual descriptions and video regions, improving compositional consistency. We theoretically demonstrate that JDM improves text-video alignment by directly optimizing for fine-grained correspondences rather than relying on implicit learning from data. Experimental results show that JDM significantly enhances alignment while maintaining high video quality. Furthermore, JDM unifies video generation and segmentation within a single framework, paving the way for more structured and controllable text-to-video synthesis.