README.md

---
license: cc-by-4.0
---

# InFlux

We present Intrinsics in Flux (InFlux), a real-world benchmark that provides per-frame ground truth intrinsics annotations for videos with dynamic intrinsics. Compared to prior benchmarks, InFlux captures a wider range of intrinsic variations and scene diversity, featuring 143K+ annotated frames from 386 high-resolution indoor and outdoor videos with dynamic camera intrinsics.  

For more information about this dataset, please visit our website: https://influx.cs.princeton.edu/. Please find data download and submission instructions in the [official repository](https://github.com/princeton-vl/InFlux/tree/main).


### Viewing `.mp4` Files

The `.mp4` files in this dataset require VLC media viewer to play locally. Please download VLC [here](https://www.videolan.org/).

### Dataset Structure

The dataset includes 386 `.mp4` videos and 2 `.json` files in the root directory:

- **Dynamic Intrinsics Videos (`.mp4`)**  
  Videos with dynamic intrinsics, moving objects, and camera motion.  

- **Frame Counts and Split (`video_frame_count_and_split.json`)**  
  Maps each video to its number of frames and whether it belongs to the validation or test split.  

- **Validation Ground Truth (`gt_validation_dict.json`)**  
  Maps validation video frames to ground truth intrinsics values.

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### JSON File Structures

#### `video_frame_count_and_split.json`

```json
{
    "video_shot_1": {
        "frame_count": 1234,
        "split": "val"
    }
}
```

- `frame_count` – Number of frames in the video.

- `split` – Denotes which split the video belongs in. The value will either be "val" or "test".

#### `gt_validation_dict.json`

```json
{
    "video_shot_1": {
        "0": {
            "intrinsics_gt": {
                "fx": ..., "fy": ..., "cx": ..., "cy": ...,
                "k1": ..., "k2": ..., "p1": ..., "p2": ...
            },
            "intrinsics_gt_extrapolated": { ... },
            "lens_metadata": {
                "focal_length_mm": ...,
                "focus_distance_m": ...
            }
        },
        "1": { ... },
        ...
    }
}
```

**Per-frame keys:**
- `intrinsics_gt` – Ground truth intrinsics from look-up table (LUT) interpolation.
    - `fx, fy, cx, cy, k1, k2, p1, p2` denote the intrinsics parameters as specified by the rad-tan Brown-Conrady distortion model.

- `intrinsics_gt_extrapolated` – The same as `intrinsics_gt`, but also provides extrapolated intrinsics if lens metadata is outside of LUT bounds. It contains the same fields as `intrinsics_gt`.

- `lens_metadata` – Raw physical lens parameters `focal_length_mm`, `focus_distance_m`