Yijun Liu

EchoWM: Open and Enterable Omnimodal World Models

Songchun Zhang, Yaowei Li, Junhao Zhuang, Weiyang Jin et autres

We present EchoWM, an omnimodal world model for enterable generative media that responds to continuous navigation while jointly generating 720p video, environmental sound, music and speech. We organize interaction around camera intent: in first-person scenes, it specifies observer motion, while in third-person …

Long-Horizon Audio-Visual Generation for Persistent Stories and Interactive Worlds

Nan Duan, Haoyang Huang, Weiyang Jin, Haoran Li et autres

Video generation is progressing beyond isolated clips toward long-form narratives and interactive worlds, requiring models to preserve identities, follow user controls, and remain stable over extended rollouts. We present JoyAI-Echo-1.5, a unified audio-visual generation system with two purpose-built variants. The long-video variant …

EchoStory: Slot-Paired Audio-Visual Memory for Multi-Shot Long Audio-Video Storytelling

Jie Huang, Yijun Liu, Haojun Xu, Yuming Li et autres

HPSv3++: Scaling Reward Models Across the Full Spectrum of Diffusion Model Capabilities

Yijun Liu, J W Huang, Zeyue Xue, Yuming Li et autres

Reward models guide text-to-image (T2I) systems toward outputs aligned with human preferences. However, typical reward models such as HPSv3 are trained on pre-annotated data from earlier T2I models, without accounting for quality discriminative shifts arising from evolving model capabilities and reinforcement learning …

Ultra Flash: Scaling Real-Time Streaming Video Generation to High Resolutions

Luxury, Jie Huang, Zihao Fan, Xiaoxiao Ma et autres

While recent autoregressive video diffusion models achieve remarkable streaming quality, they remain confined to low resolutions (e.g., 480P), leaving efficient, scalable, real-time high-resolution video generation a fundamental open challenge. To bridge this gap, we present Ultra Flash, a cascaded streaming framework capable …

Foundation-Prior-Guided Target Scene Adaptation for Underwater Stereo Metric Depth Estimation

Kan Huang, Yijun Liu, Jihao Liu, Zhiliang Lin