Griffon v2: Advancing Multimodal Perception with High-Resolution Scaling
  and Visual-Language Co-Referring
Authors: name: Yufei Zhan, name: Yousong Zhu, name: Hongyin Zhao, name: Fan Yang, name: Ming Tang, name: Jinqiao Wang

Large Vision Language Models have achieved fine-grained object perception,
but the limitation of image resolution remains a significant obstacle to
surpass the performance of task-specific experts in complex and dense
scenarios. Such limitation further restricts the model's potential to achieve
nuanced visual and language referring in domains such as GUI Agents, Counting
and \etc. To address this issue, we introduce a unified high-resolution
generalist model, Griffon v2, enabling flexible object referring with visual
and textual prompts. To efficiently scaling up image resolution, we design a
simple and lightweight down-sampling projector to overcome the input tokens
constraint in Large Language Models. This design inherently preserves the
complete contexts and fine details, and significantly improves multimodal
perception ability especially for small objects. Building upon this, we further
equip the model with visual-language co-referring capabilities through a
plug-and-play visual tokenizer. It enables user-friendly interaction with
flexible target images, free-form texts and even coordinates. Experiments
demonstrate that Griffon v2 can localize any objects of interest with visual
and textual referring, achieve state-of-the-art performance on REC, phrase
grounding, and REG tasks, and outperform expert models in object detection and
object counting. Data, codes and models will be released at
https://github.com/jefferyZhan/Griffon.