Update README.md

README.md

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----
-license: cc-by-nc-4.0
----
+---
+license: cc-by-nc-4.0
+task_categories:
+- image-segmentation
+- surgical-workflow
+tags:
+- medical
+- microsurgery
+---
+
+# MAVIS (Micro-surgical Artificial Vascular Anastomosis)
+
+## Dataset Overview
+
+MAVIS is a microsurgical dataset comprising 19 videos of artificial vascular anastomosis procedures performed by three expert microsurgeons at Korea University. For each video frame, it provides:
+
+- **Pixel-level segmentation** of seven tool categories  
+- **Frame-level workflow annotations**: surgical stage, phase, and step  
+
+This dataset enables research on both surgical tool segmentation and surgical workflow recognition in ultra-fine microsurgical environments.
+
+## Data Collection
+
+1. **Subjects & Cases**  
+   - 19 recorded anastomosis sessions on an artificial vessel simulator  
+   - Surgeon assignments:  
+     - CASE 01–07: Surgeon 1 (Jaemin Lee)  
+     - CASE 08–14: Surgeon 2 (Yeongyun Ko)  
+     - CASE 15–19: Surgeon 3 (Jaejun Nam)  
+
+2. **Acquisition Setup**  
+   - Microscope/Camera model: ???  
+   - Original resolution: ??? px  
+   - Frame rate: ??? fps  
+   - Cropped frame size: 1920 × 1072 px  
+
+3. **Annotation Tools & Process**  
+   - **Segmentation**: ??? 
+   - **Workflow**: Manual tagging of stage/phase/step by the non-medical 
+
+4. **Annotators**  
+   - (Three fellowship-trained microsurgeons)(확인 필요)
+   - Labels applied following a standardized workflow guideline  
+
+## Data Details
+
+### Directory Structure
+
+```
+MAVIS
+├── frames
+│   ├── CASE01
+│   │   ├── image_00001.jpg
+│   │   └── ...
+│   ├── ...
+├── annotations
+│   ├── long-term.json
+│   ├── short-term.json
+│   ├── segmentations
+│   │   ├── CASE01
+│   │   │   ├── image_00001.png
+│   │   │   └── ...
+│   │   ├── ...
+│   └── segmentations_with_keypoint
+│       ├── CASE01
+│       │   ├── image_00001.png
+│       │   └── ...
+│       ├── ...
+├── fig
+└── README.md
+```
+
+### Annotation Formats
+
+- **short-term.json**  
+  - For each frame: polygon mask data for seven tool classes(CASE마다 약 64장 정도씩만 있는 것 언급하는게 좋을지?)
+- **long-term.json**  
+  - For each frame: stage, phase, and step labels  
+
+
+### Stage–Phase–Step Hierarchy
+
+The workflow annotations are organized into six **Stages**, each containing one or more **Phases**, which in turn consist of individual **Steps**. Below is the full breakdown with descriptions:
+
+1. **First tying** (forming the first knot)  
+   1. **Phase: Suturing** – place and position the suture  
+      - **Needle holding**: grasp the suture needle securely with the needle holder  
+      - **Needle passing**: insert the needle through both edges of the vessel and pull it through  
+      - **Needle dropping**: release the needle at the optimal position for tying (≈5 o’clock)  
+   2. **Phase: Knot tying** – create the knot  
+      - **1st knot**: wrap the free end of the suture around the instrument and tighten  
+      - **2nd knot**: repeat wrapping in the opposite direction and tighten  
+      - **3rd knot**: final wrap to secure the stitch  
+   3. **Phase: Cutting** – trim excess suture  
+      - **Cutting**: use scissors to sever both ends of the suture (can cut both at once or sequentially)  
+
+2. **Second tying** (forming the second knot at a rotated position) (6개 stage가 되려면 120°, 180° tying을 분리해야 하는데 설명을 추가할지?)
+   - *Subtasks*: identical to First tying (Suturing → Knot tying → Cutting)  
+
+3. **Front side tying** (additional knot on the front face between first and second)  
+   - *Subtasks*: identical to First tying  
+
+4. **Flip** (reorient vessel for back‐side access)  
+   - **Phase: Flip** – flip the vessel clamp  
+     - **Flip clamp**: reposition the clamp so that the vessel’s backside faces the camera  
+
+5. **Back side tying** (forming knots on the backside between first and second)  
+   - *Subtasks*: identical to First tying  
+
+
+### Tool Segmentation Classes
+
+The dataset contains the following classes:
+
+| Class ID | Class Name       |RGB Color       |
+|----------|------------------|----------------|
+| 0        | forceps          |(253, 0, 26)    |
+| 1        | scissors         |(43, 253, 62)   |
+| 2        | vascular_clamps  |(0, 43, 249)    |
+| 3        | needle_holder    |(255, 253, 66)  |
+| 4        | vessel           |(253, 40, 250)  |
+| 5        | needle           |(38, 255, 254)  |
+| 6        | thread           |(198, 161, 251) |
+
+## Examples of Labeled Data
+
+Figure 1, 2, 3 shows some examples of labeled data.
+
+<figure>
+  <img src="./fig/ex1.jpg" width="1920" height="1072"/>
+  <figcaption>Figure 1: Example of Segmentation Mask of Image 1</figcaption>
+</figure>
+
+<figure>
+  <img src="./fig/ex2.jpg" width="1920" height="1072"/>
+  <figcaption>Figure 2: Example of Segmentation Mask of Image 2</figcaption>
+</figure>
+
+<figure>
+  <img src="./fig/ex3.jpg" width="1920" height="1072"/>
+  <figcaption>Figure 3: Example of Segmentation Mask of Image 3</figcaption>
+</figure>
+
+
+## Citation
+
+```bibtex
+@misc{
+}