Update README.md

README.md

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-license: cc-by-nc-4.0
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+---
+license: cc-by-nc-4.0
+---
+
+# LRID Dataset
+
+## 📖 Overview
+This is the **full version** of the **Low-light Raw Image Denoising (LRID)** dataset, designed for low-light image denoising research. It is part of the PMN_TPAMI project (Learnability Enhancement for Low-light Raw Denoising: A Data Perspective, TPAMI 2024).  
+
+GitHub: https://github.com/megvii-research/PMN/tree/TPAMI
+
+## 🗂️ Dataset Structure
+```
+PMN_TPAMI 
+ └─LRID       # Full LRID Dataset (Raw Data)
+   ├─bias       # Dark Frames
+   ├─bias-hot   # Dark Frames in hot mode of the sensor
+   │
+   ├─indoor_x5  # Indoor Scenes
+   │ ├─100      # Long-Exposure Raw Data (ISO-100)
+   │ │ ├─000    # Scene Number (25 frames per scene)
+   │ │ └─...
+   │ │
+   │ ├─6400     # Low-Light Noisy Data (ISO-6400)
+   │ │ ├─1      # Digital Gain (Low-Light Ratio)
+   │ │ │ ├─000  # Scene Number (10 frames per scene)
+   │ │ │ └─...
+   │ │ └─...
+   │ │
+   │ ├─ref      # Long-Exposure Raw Data (ISO-100)
+   │ │ ├─000    # Scene Number (ISO-100 reference frame and its JPEG image after *camera ISP*)
+   │ │ └─...    
+   │ │
+   │ ├─GT       # Visualization of Scenes and Our Fusion Process
+   │ │
+   │ ├─npy      # Binary Data
+   │ │ ├─GT_flow                  # Optical Flows for Alignment (by HDR+)
+   │ │ ├─GT_aligns                # ISO-100 Frames after Alignment
+   │ │ └─GT_align_ours            # GT after Multi-Frame Fusion
+   │ │
+   │ └─metadata_indoor_x5_gt.pkl  # Metadata such as WB, CCM, etc.
+   │
+   ├─outdoor_x3 # Outdoor Scenes
+   │ └─...      # (Structure similar to indoor_x5)
+   │
+   ├─indoor_x3  # Indoor Scenes with ND Filter
+   │ └─...      # (Structure similar to indoor_x5)
+   │
+   ├─outdoor_x5 # [Abandon] Extremely Dark Outdoor Scenes with Ultra-Long Exposure
+   │ └─...      # (Structure similar to indoor_x5)
+   │
+   └─resources  # (Noise calibration results such as dark shading)
+```
+
+## 🎯 Key Features
+- **Full version**:  
+  - ✅ Original images used for dataset creation are included.  
+  - ✅ Intermediate results are included.  
+  - ✅ All noisy frames used for training are included.
+  - ✅ Dark frames (`bias`, `bias-hot`) are included for calibration.  
+  - ✅ Reference data (`ref/`) provides ISO-100 long-exposure RAW and its camera-processed JPEG for each scene.
+
+## 📊 Scene Categories
+| Subset | Description | Gain | Lighting Condition |
+|--------|-------------|------|-------------------|
+| `indoor_x5` | Indoor scenes | 5× | Low-light |
+| `outdoor_x3` | Outdoor scenes | 3× | Low-light |
+| `indoor_x3` | Indoor scenes with ND filter | 3× | Controlled lighting |
+| `outdoor_x5` (abandon) | Outdoor scenes | 5× | Low-light (a little misalignment) |
+
+## 🔍 Contents Description
+- **Noisy frames** (e.g., `indoor_x5/6400/1/000/`): contain the **first frame** of each burst in RAW format.  
+- **Ground truth** (`npy/GT_align_ours`): multi-frame fusion results stored as NumPy binaries (aligned and denoised).  
+- **Reference** (`ref/`): for each scene, an ISO-100 long-exposure RAW and its corresponding JPEG (processed by the camera ISP) are provided as ideal references.  
+- **Metadata** (`.pkl` files): include white balance gains, color correction matrices (CCM), and other camera parameters essential for accurate raw data processing.  
+- **Dark frames** (`bias/`, `bias-hot/`): sensor bias frames under normal and hot modes, useful for noise calibration and dark current subtraction.  
+- **Resources** (`resources/`): calibration data such as dark shading patterns.
+
+## ⚙️ Usage Notes
+- Ground truth images are generated by aligning and fusing multiple frames, providing high-quality clean references.  
+- The `ref/` folders contain the ISO-100 long-exposure captures, which serve as near-ideal clean references for evaluating denoising performance.  
+- Metadata files are crucial for correctly interpreting the raw sensor data; please refer to them when applying any ISP pipeline.
+
+## 🔗 Access
+**Simplified LRID Dataset**: The simplified version with all evaluation frames (1 frames per scene) has been uploaded to https://huggingface.co/datasets/hansen97/LRID_simplified
+
+## 📝 Citation
+If you use this dataset in your research, please cite:
+```
+@inproceedings{feng2022learnability,
+    author = {Feng, Hansen and Wang, Lizhi and Wang, Yuzhi and Huang, Hua},
+    title = {Learnability Enhancement for Low-Light Raw Denoising: Where Paired Real Data Meets Noise Modeling},
+    booktitle = {Proceedings of the 30th ACM International Conference on Multimedia},
+    year = {2022},
+    pages = {1436–1444},
+    numpages = {9},
+    location = {Lisboa, Portugal},
+    series = {MM '22}
+}
+
+@ARTICLE{feng2023learnability,
+  author={Feng, Hansen and Wang, Lizhi and Wang, Yuzhi and Fan, Haoqiang and Huang, Hua},
+  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
+  title={Learnability Enhancement for Low-Light Raw Image Denoising: A Data Perspective}, 
+  year={2024},
+  volume={46},
+  number={1},
+  pages={370-387},
+  doi={10.1109/TPAMI.2023.3301502}
+}
+```
+
+## 📧 Contact
+For questions or issues, please contact Hansen at [hansen97@outlook.com](mailto:hansen97@outlook.com).