LISA: Reasoning Segmentation via Large Language Model
Open accessAbstract
Although perception systems have made remarkable ad-vancements in recent years, they still rely on explicit human instruction or pre-defined categories to identify the target objects before executing visual recognition tasks. Such systems cannot actively reason and comprehend implicit user intention. In this work, we propose a new segmentation task - reasoning segmentation. The task is designed to output a segmentation mask given a complex and implicit query text. Furthermore, we establish a benchmark comprising over one thousand image-instruction-mask data samples, incorporating intricate reasoning and world knowledge for evaluation purposes. Finally, we present LISA: large Language Instructed Segmentation Assistant, which inherits the language generation capabilities of multimodal Large Language Models (LLMs) while also possessing the ability to produce segmentation masks. We expand the original vocabulary with atoken and propose the embedding-as-mask paradigm to unlock the segmentation capability. Remarkably, LISA can handle cases involving complex rea-soning and world knowledge. Also, it demonstrates robust zero-shot capability when trained exclusively on reasoning-free datasets. In addition, fine-tuning the model with merely 239 reasoning segmentation data samples results in further performance enhancement. Both quantitative and qualitative experiments show our method effectively unlocks new reasoning segmentation capabilities for multimodal LLMs. Code, models, and data are available at github.com/dvlab-research/LISA.
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General-purpose MLLMs such as LISA exhibit poor performance on medical datasets.
“We observe that general-purpose MLLMs, such as LISA (Lai et al., 2024), exhibit poor performance on these medical datasets.”
From MedSAM-Agent: Empowering Interactive Medical Image Segmentation with Multi-turn Agentic Reinforcement Learning (2026) · cites this paper as Lai et al., 2024
LISA-style MLLMs require MLLMs to learn task-specific implicit tokens and undergo additional joint fine-tuning with a segmentation decoder.
“While promising, these methods require MLLMs to learn task-specific implicit tokens and undergo additional joint fine-tuning with a segmentation decoder.”
From IBISAgent: Reinforcing Pixel-Level Visual Reasoning in MLLMs for Universal Biomedical Object Referring and Segmentation (2026) · cites this paper as [18]
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Cites
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Self-citation
- Authors
- Lai, X., Tian, Z., Chen, Y., Li, Y., Yuan, Y., Liu, S., & Jia, J.
- Affiliations
- Chinese University of Hong Kong (HK)
- HIT (Shenzhen)
- MSRA
- SmartMore
- Venue
- 2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)
- Publisher
- IEEE
- Published
- 2024-06-16
- Pages
- 9579-9589
- ISSN
- 1063-6919 (ISSN-L)
- OpenAlex
- W4402754134
- Cited by
- 466
- References
- 8
- Citations by year
- 2026: 179 · 2025: 182 · 2024: 101 · 2023: 4
- FWCI
- 95.37
- Type
- conference paper
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings (publishedVersion)
- arXiv (Cornell University) (submittedVersion, cc-by-nc-sa)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Multimodal Machine Learning Applications
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
- Physical Sciences › Computer Science › Artificial Intelligence › Domain Adaptation and Few-Shot Learning
- Keywords
- image segmentation, multimodal large language models, zero-shot segmentation, segmentation benchmark, LISA
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