Researcher · Multimodal

Haoxian Tan

Researcher at Meituan Inc.

Haoxian Tan

I am a researcher at Meituan Inc., where I work on large multimodal models, diffusion models, and AI design agents.

My research is particularly focused on building commercial image generation systems — spanning the full stack from data curation, training of large-scale generative models, to rigorous evaluation of generation quality.

Previously, my work mainly explored the application of multimodal large language models to fine-grained visual perception — including language-guided segmentation, multi-granular visual understanding, and self-reflection frameworks for multimodal understanding and generation.

Large Multimodal Models Diffusion Models AI Design Agents

2026

ECCV 2026

UniReflect: Self-Reflection Tuning for Unified Multimodal Understanding and Generation

Cong Wei, Zepeng Huang, Haoxian Tan, Liang Da Shuang, Lishuai Gao, Pengfei Yan, Xiaoming Wei

First unified visual understanding-and-generation framework with in-model self-reflection verification.

ACM MM 2026

APT: Alignment-Preserving Video Tokenizer for Non-Destructive Image-to-Video Adaptation

Lishuai Gao, Yujie Zhong, Yifan Li, Haoxian Tan, Jie Hu, Zhuoliang Kang, Zan Gao, Xiaoming Wei

Plug-and-play video tokenizer preserving image–language alignment for image-to-video adaptation.

2025

arXiv preprint

LongCat-Image

Haoxian Tan, et al. (Meituan LongCat Team)

Open-source bilingual image-generation foundation model with state-of-the-art multilingual text rendering.

CVPR 2025

HyperSeg: Hybrid Segmentation Assistant with Fine-Grained Visual Perceiver

Cong Wei, Yujie Zhong, Haoxian Tan, Yong Liu, Jie Hu, Dengjie Li, Zheng Zhao, Yujiu Yang

First VLLM-based universal segmentation model for pixel-level image and video perception.

ICCV 2025

InstructSeg: Unifying Instructed Visual Segmentation with Multi-Modal Large Language Models

Cong Wei, Yujie Zhong, Haoxian Tan, Yingsen Zeng, Yong Liu, Hongfa Wang, Yujiu Yang

End-to-end MLLM unifying referring and reasoning segmentation across image and video.

ICCV 2025

Advancing Visual Large Language Model for Multi-Granular Versatile Perception

Haoxian Tan, Wentao Xiang, Yujie Zhong, Cong Wei, Dengjie Li, Yujiu Yang

Multi-granular perception framework unifying word- and sentence-level tasks with box and mask predictions.

2024

arXiv preprint

LaSagnA: Language-based Segmentation Assistant for Complex Queries

Cong Wei, Haoxian Tan, Yujie Zhong, Yujiu Yang, Lin Ma

Segmentation architecture handling multi-target queries and absent-object detection via complex-query formats.