README.md

metadata

task_categories:
  - image-segmentation
  - object-detection
  - video-text-to-text
license: cc-by-nc-sa-4.0

MeViS: A Multi-Modal Dataset for Referring Motion Expression Video Segmentation

\ud83c\udfe0[Project page]  \ud83d\udcc4[Paper]   \ud83d\udcc4[arXiv]   \ud83d\udcbe[Evaluation Server v1 (legacy)]  \ud83d\udd25[Evaluation Server v2]

This repository contains code for ICCV2023 and TPAMI 2025 paper:

MeViS: A Multi-Modal Dataset for Referring Motion Expression Video Segmentation
Henghui Ding, Chang Liu, Shuting He, Kaining Ying, Xudong Jiang, Chen Change Loy, Yu-Gang Jiang TPAMI 2025

MeViS: A Large-scale Benchmark for Video Segmentation with Motion Expressions
Henghui Ding, Chang Liu, Shuting He, Xudong Jiang, Chen Change Loy
ICCV 2023

Figure 1. Examples from Motion expressions Video Segmentation (MeViS) showing the dataset’s nature and complexity. The selected target objects are masked in orange ▇. The expressions in MeViS primarily focus on motion attributes, making it impossible to identify the target object from a single frame. For example, the first example has three parrots with similar appearances, and the target object is identified as “The bird flying away”. This object can only be recognized by capturing its motion throughout the video. The updated MeViS 2024 further provides motion-reasoning and no-target expressions, adds audio expressions alongside text, and provides mask and bounding box trajectory annotations.

TABLE 1. Scale comparison between MeViS and existing language-guided video segmentation datasets.

Dataset	Pub.&Year	Videos	Object	Expression	Mask	Obj/Video	Obj/Expn	Target	Multi-target	No-target	Audio
A2D Sentence	CVPR 2018	3,782	4,825	6,656	58k	1.28	1	Actor	-	-	-
DAVIS17-RVOS	ACCV 2018	90	205	205	13.5k	2.27	1	Object	-	-	-
ReferYoutubeVOS	ECCV 2020	3,978	7,451	15,009	131k	1.86	1	Object	-	-	-
MeViS 2023	ICCV 2023	2,006	8,171	28,570	443k	4.28	1.59	Object(s)	7,539	-	-
MeViS 2024	TPAMI	2,006	8,171	33,072	443k	4.28	1.58	Object(s)	8,028	3,503	33,072

MeViS v2 Dataset

Dataset Split

• 2,006 videos & 33,458 sentences in total;
• Train set: 1662 videos & 27,502 sentences, used for training;
• Val^u set: 50 videos & 907 sentences, ground-truth provided, used for offline self-evaluation (e.g., ablation study) during training;
• Val set: 140 videos & 2,523 sentences, ground-truth not provided, used for CodaLab online evaluation;
• Test set: Will be progressively and selectively released and used for evaluation during the competition periods (PVUW, LSVOS);

It is suggested to report the results on Val^u set and Val set.

Online Evaluation

Please submit your results of Val set on

• 💯 v1 server (Closing Soon): CodaLab
• 💯 v2 server: CodaBench.

It is strongly suggested to first evaluate your model locally using the Val^u set before submitting your results of the Val to the online evaluation system.

File Structure

The dataset follows a similar structure as Refer-YouTube-VOS. Each split of the dataset consists of three parts: JPEGImages, which holds the frame images, meta_expressions.json, which provides referring expressions and metadata of videos, and mask_dict.json, which contains the ground-truth masks of objects. Ground-truth segmentation masks are saved in the format of COCO RLE, and expressions are organized similarly like Refer-Youtube-VOS.

Please note that while annotations for all frames in the Train set and the Val^u set are provided, the Val set only provide frame images and referring expressions for inference.

mevis
├── train                       // Split Train
│   ├── JPEGImages
│   │   ├── <video #1  >
│   │   ├── <video #2  >
│   │   └── <video #...>
│   │
│   ├── mask_dict.json
│   └── meta_expressions.json
│
├── valid_u                     // Split Val^u
│   ├── JPEGImages
│   │   └── <video ...>
│   │
│   ├── mask_dict.json
│   └── meta_expressions.json
│
└── valid                       // Split Val
    ├── JPEGImages
    │   └── <video ...>
    │
    └── meta_expressions.json

BibTeX

Please consider to cite MeViS if it helps your research.

@inproceedings{MeViS,
  title={{MeViS}: A Large-scale Benchmark for Video Segmentation with Motion Expressions},
  author={Ding, Henghui and Liu, Chang and He, Shuting and Jiang, Xudong and Loy, Chen Change},
  booktitle={ICCV},
  year={2023}
}

@inproceedings{GRES,
  title={{GRES}: Generalized Referring Expression Segmentation},
  author={Liu, Chang and Ding, Henghui and Jiang, Xudong},
  booktitle={CVPR},
  year={2023}
}

@article{VLT,
  title={{VLT}: Vision-language transformer and query generation for referring segmentation},
  author={Ding, Henghui and Liu, Chang and Wang, Suchen and Jiang, Xudong},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence},
  year={2023},
  publisher={IEEE}
}

A majority of videos in MeViS are from MOSE: Complex Video Object Segmentation Dataset.

@inproceedings{MOSE,
  title={{MOSE}: A New Dataset for Video Object Segmentation in Complex Scenes},
  author={Ding, Henghui and Liu, Chang and He, Shuting and Jiang, Xudong and Torr, Philip HS and Bai, Song},
  booktitle={ICCV},
  year={2023}
}