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README.md

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 license: cc-by-4.0
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+
+# Neural 3D Video Dataset - Processed
+
+This directory contains preprocessed multi-view video data from the Neural 3D Video dataset, converted into a format suitable for 4D reconstruction and novel view synthesis tasks.
+
+## Dataset Overview
+
+**Source Dataset**: Neural 3D Video  
+**License**: CC-BY-4.0  
+**Processed Scenes**: 5 dynamic cooking scenes captured from multiple camera angles
+
+### Scenes
+
+| Scene | Description | Cameras | Frames |
+|-------|-------------|---------|--------|
+| `coffee_martini` | Making a coffee martini cocktail | 18 | 32 |
+| `cook_spinach` | Cooking spinach in a pan | 18 | 32 |
+| `cut_roasted_beef` | Cutting roasted beef | 18 | 32 |
+| `flame_salmon_1` | Flambé salmon preparation | 18 | 32 |
+| `sear_steak` | Searing steak in a pan | 18 | 32 |
+
+## Directory Structure
+
+```
+Neural-3D-Video-Dataset/
+├── README.md (this file)
+├── coffee_martini_processed/
+│   ├── 256/                          # 256×256 resolution
+│   │   ├── images/                   # 32 frame images
+│   │   │   ├── sample_000_cam00.jpg
+│   │   │   ├── sample_001_cam01.jpg
+│   │   │   └── ...
+│   │   ├── transforms.json           # Camera poses (JSON format)
+│   │   ├── transforms.npz            # Camera poses (NumPy format)
+│   │   └── camera_visualization.html # Interactive 3D camera viewer
+│   └── 512/                          # 512×512 resolution
+│       ├── images/
+│       ├── transforms.json
+│       ├── transforms.npz
+│       └── camera_visualization.html
+├── cook_spinach_processed/
+│   ├── 256/ ...
+│   └── 512/ ...
+├── cut_roasted_beef_processed/
+│   ├── 256/ ...
+│   └── 512/ ...
+├── flame_salmon_1_processed/
+│   ├── 256/ ...
+│   └── 512/ ...
+└── sear_steak_processed/
+    ├── 256/ ...
+    └── 512/ ...
+```
+
+## Data Format
+
+### Camera Poses (`transforms.json`)
+
+The camera poses are stored in a JSON file with the following structure:
+
+```json
+{
+    "frames": [
+        {
+            "front": {
+                "timestamp": 0,
+                "file_path": "./images/sample_000_cam00.jpg",
+                "w": 256,
+                "h": 256,
+                "fx": 341.33,
+                "fy": 341.33,
+                "cx": 128.0,
+                "cy": 128.0,
+                "w2c": [[...], [...], [...], [...]],     // 4×4 world-to-camera matrix
+                "c2w": [[...], [...], [...]],             // 3×4 camera-to-world matrix
+                "blender_camera_location": [x, y, z]     // Camera position in world coordinates
+            }
+        },
+        ...
+    ]
+}
+```
+
+**Intrinsics** (camera internal parameters):
+- **256×256**: `fx = fy = 341.33`, `cx = cy = 128.0`
+- **512×512**: `fx = fy = 682.67`, `cx = cy = 256.0`
+
+**Extrinsics** (camera external parameters):
+- `w2c`: 4×4 world-to-camera transformation matrix
+- `c2w`: 3×4 camera-to-world transformation matrix (rotation + translation)
+- `blender_camera_location`: 3D camera position `[x, y, z]` in world coordinates
+
+### NumPy Format (`transforms.npz`)
+
+For convenience, camera parameters are also provided in NumPy format:
+
+```python
+import numpy as np
+
+data = np.load('transforms.npz')
+intrinsics = data['intrinsics']          # (32, 3, 3) - intrinsic matrices
+extrinsics_w2c = data['extrinsics_w2c']  # (32, 4, 4) - world-to-camera
+extrinsics_c2w = data['extrinsics_c2w']  # (32, 4, 4) - camera-to-world
+camera_positions = data['camera_positions']  # (32, 3) - camera locations
+```
+
+### Frame Images
+
+- **Format**: JPEG
+- **Resolutions**: 256×256 and 512×512
+- **Count**: 32 frames per scene
+- **Naming**: `sample_{frame:03d}_cam{camera:02d}.jpg`
+
+Each frame is extracted from a different camera view:
+- Frame 0 → cam00
+- Frame 1 → cam01
+- ...
+- Frame 17 → cam20
+- Frame 18 → cam00 (loops back)
+- ...
+- Frame 31 → cam14
+
+## Data Processing
+
+### Original Data
+
+- **Source resolution**: 2704×2028 (4:3 aspect ratio)
+- **Original format**: Multi-view MP4 videos
+- **Camera model**: LLFF format with `poses_bounds.npy`
+
+### Processing Pipeline
+
+1. **Center Crop**: 2704×2028 → 2028×2028 (square)
+2. **Resize**: 2028×2028 → 256×256 or 512×512
+3. **Intrinsics Adjustment**: Focal length and principal point adjusted for crop and resize
+4. **Extrinsics Extraction**: Camera poses extracted from LLFF format
+5. **Format Conversion**: Converted to standard c2w/w2c matrices
+
+### Frame Sampling Strategy
+
+To capture the dynamic motion from multiple viewpoints, frames are sampled such that each frame shows the scene from a different camera angle in sequence. This creates a "synchronized" multi-view video where:
+- The temporal progression shows the dynamic action
+- Each frame provides a different spatial viewpoint
+- Camera angles loop after exhausting all 18 cameras
+
+## Camera Visualization
+
+Each processed scene includes an interactive 3D camera visualization (`camera_visualization.html`):
+
+- **View camera positions** and orientations in 3D space
+- **Interactive**: Rotate, pan, and zoom to explore the camera rig
+- **Camera frustums**: Visualize the viewing direction and field of view
+- **Trajectory path**: See the sequence of frames and camera transitions
+- **Powered by Plotly**: High-quality interactive graphics
+
+Open the HTML file in any web browser to explore the camera setup.
+
+## Usage Examples
+
+### Loading Camera Poses (Python)
+
+```python
+import json
+import numpy as np
+
+# Load from JSON
+with open('coffee_martini_processed/256/transforms.json', 'r') as f:
+    data = json.load(f)
+    
+# Access first frame
+frame0 = data['frames'][0]['front']
+print(f"Camera intrinsics: fx={frame0['fx']}, fy={frame0['fy']}")
+print(f"Camera position: {frame0['blender_camera_location']}")
+print(f"Image path: {frame0['file_path']}")
+
+# Load from NumPy
+poses = np.load('coffee_martini_processed/256/transforms.npz')
+intrinsics = poses['intrinsics']  # (32, 3, 3)
+c2w = poses['extrinsics_c2w']     # (32, 4, 4)
+```
+
+### Loading Images
+
+```python
+import cv2
+import os
+
+scene_dir = 'coffee_martini_processed/256'
+img_dir = os.path.join(scene_dir, 'images')
+
+# Load all frames
+frames = []
+for i in range(32):
+    img_path = os.path.join(img_dir, f'sample_{i:03d}_cam*.jpg')
+    # Find the actual file (camera number may vary)
+    import glob
+    img_file = glob.glob(img_path)[0]
+    img = cv2.imread(img_file)
+    frames.append(img)
+
+print(f"Loaded {len(frames)} frames, shape: {frames[0].shape}")
+```
+
+### PyTorch Dataset Example
+
+```python
+import torch
+from torch.utils.data import Dataset
+from PIL import Image
+import json
+import numpy as np
+
+class Neural3DVideoDataset(Dataset):
+    def __init__(self, scene_dir):
+        self.scene_dir = scene_dir
+        
+        # Load transforms
+        with open(os.path.join(scene_dir, 'transforms.json'), 'r') as f:
+            self.data = json.load(f)
+        
+        self.frames = self.data['frames']
+    
+    def __len__(self):
+        return len(self.frames)
+    
+    def __getitem__(self, idx):
+        frame_data = self.frames[idx]['front']
+        
+        # Load image
+        img_path = os.path.join(self.scene_dir, frame_data['file_path'])
+        img = Image.open(img_path).convert('RGB')
+        img = torch.from_numpy(np.array(img)).float() / 255.0
+        
+        # Get camera parameters
+        intrinsics = torch.tensor([
+            [frame_data['fx'], 0, frame_data['cx']],
+            [0, frame_data['fy'], frame_data['cy']],
+            [0, 0, 1]
+        ], dtype=torch.float32)
+        
+        c2w = torch.tensor(frame_data['c2w'], dtype=torch.float32)
+        
+        return {
+            'image': img,
+            'intrinsics': intrinsics,
+            'c2w': c2w,
+            'timestamp': frame_data['timestamp']
+        }
+
+# Usage
+dataset = Neural3DVideoDataset('coffee_martini_processed/256')
+sample = dataset[0]
+print(f"Image shape: {sample['image'].shape}")
+print(f"Camera position: {sample['c2w'][:, 3]}")
+```
+
+## Technical Details
+
+### Camera Configuration
+
+- **Number of cameras**: 18 per scene
+- **Camera arrangement**: Surrounding the scene in a roughly circular pattern
+- **Frame rate**: 30 FPS (original videos)
+- **Camera model**: Pinhole camera with radial distortion (pre-undistorted)
+
+### Coordinate System
+
+- **World coordinates**: Right-handed coordinate system
+- **Camera coordinates**: 
+  - X-axis: Right
+  - Y-axis: Down
+  - Z-axis: Forward (viewing direction)
+- **c2w matrix**: Transforms from camera space to world space
+- **w2c matrix**: Transforms from world space to camera space
+
+### Quality Settings
+
+- **JPEG quality**: 95
+- **Interpolation**: Bilinear (cv2.INTER_LINEAR)
+- **Color space**: RGB (8-bit per channel)
+
+## Citation
+
+If you use this dataset in your research, please cite the original Neural 3D Video dataset:
+
+```bibtex
+@article{neural3dvideo2021,
+  title={Neural 3D Video Synthesis},
+  author={Author Names},
+  journal={Conference/Journal Name},
+  year={2021}
+}
+```
+
+## Processing Scripts
+
+The data was processed using custom scripts available in the parent directory:
+- `create_sync_video_with_poses.py` - Single scene processing
+- `batch_process_scenes.py` - Batch processing for all scenes
+
+## License
+
+This processed dataset inherits the CC-BY-4.0 license from the original Neural 3D Video dataset. Please respect the license terms when using this data.
+
+## Contact
+
+For questions or issues regarding this processed dataset, please contact the dataset maintainer.

coffee_martini_processed/256/transforms.json

@@ -0,0 +1,2020 @@
+{
+    "frames": [
+        {
+            "front": {
+                "timestamp": 0,
+                "file_path": "./images/sample_000_cam00.jpg",
+                "w": 256,
+                "h": 256,
+                "fx": 341.33333333333337,
+                "fy": 341.33333333333337,
+                "cx": 128.0,
+                "cy": 128.0,
+                "w2c": [
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+                        1.0
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+                ],
+                "c2w": [
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+                        0.44396468423162905
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+                    -0.3499272977464685
+                ]
+            }
+        },
+        {
+            "front": {
+                "timestamp": 1,
+                "file_path": "./images/sample_001_cam01.jpg",
+                "w": 256,
+                "h": 256,
+                "fx": 341.33333333333337,
+                "fy": 341.33333333333337,
+                "cx": 128.0,
+                "cy": 128.0,
+                "w2c": [
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+                        -2.1284754067505243
+                    ],
+                    [
+                        0.0,
+                        0.0,
+                        0.0,
+                        1.0
+                    ]
+                ],
+                "c2w": [
+                    [
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+                        0.8750079850214529,
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+                    0.6109348226657055
+                ]
+            }
+        },
+        {
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+        {
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+                "w": 256,
+                "h": 256,
+                "fx": 341.33333333333337,
+                "fy": 341.33333333333337,
+                "cx": 128.0,
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+            }
+        },
+        {
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+                "fx": 341.33333333333337,
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+                "w": 256,
+                "h": 256,
+                "fx": 341.33333333333337,
+                "fy": 341.33333333333337,
+                "cx": 128.0,
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+            }
+        }
+    ]
+}

coffee_martini_processed/256/transforms.npz

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