| --- |
| license: cc-by-4.0 |
| task_categories: |
| - image-to-image |
| tags: |
| - relighting |
| - HDR |
| - environment-map |
| - outdoor |
| - real-world |
| pretty_name: WildRelight |
| --- |
| |
|
|
| # WildRelight Dataset |
|
|
| A real-world relighting dataset of 30 outdoor/semi-indoor scenes captured across multiple time steps throughout the day. Each scene provides paired HDR photographs and HDR environment maps, enabling evaluation of outdoor relighting tasks. |
|
|
| ## Download Command |
|
|
| Download small resolution for quick verification. |
|
|
| ```bash |
| hf download lez/wildrelight --repo-type dataset --include "small-aligned/**" --local-dir ./wildrelight/small-aligned |
| ``` |
| Download full resolution dataset. |
| ```bash |
| hf download lez/wildrelight --repo-type dataset --include "ori-aligned/**" --local-dir ./wildrelight/ori-aligned |
| ``` |
|
|
| ## Key Statistics |
|
|
| | Property | Value | |
| |----------|-------| |
| | Scenes | 30 | |
| | Time steps per scene | 6–8 (spaced ~1 hour apart) | |
| | Total HDR photo/envmap pairs | 196 | |
| | Photo resolution (full) | 6048 × 4024 px | |
| | Envmap resolution (full) | 7680 × 3840 px (equirectangular) | |
| | Photo resolution (small) | 1200 × ~798 px | |
| | Envmap resolution (small) | 1200 × 600 px | |
| | File format | OpenEXR| |
| | HDR normalization | Radiance at reference shutter speed (1/500 – 1/10 s, per scene) | |
|
|
| ## Equipment |
|
|
| - **Main camera**: Sony α7 series — RAW |
| - **360° camera**: Insta360 Pro2 — 6-lens equidistant fisheye, stitched to equirectangular |
|
|
| ## Dataset Variants |
|
|
| Two resolution variants are provided under `ori/` and `small/`. Within each variant, every scene contains four folders: |
|
|
| ``` |
| {variant}/{scene}/ |
| ├── photo/ # HDR photograph (unaligned) |
| ├── photo_aligned/ # HDR photograph (temporally aligned, recommended) |
| ├── envmap/ # HDR environment map (unaligned) |
| └── envmap_aligned/ # HDR environment map (temporally aligned, recommended) |
| ``` |
|
|
| Both `photo_aligned/` and `envmap_aligned/` are temporally aligned to the first time step — each image is warped so that the static background is registered across time. Use these for relighting experiments. |
|
|
| ## File Naming |
|
|
| ``` |
| photo/ time{N}_hdr.exr (N = 0, 1, 2, …) |
| envmap/ time{N}_envmap.exr |
| ``` |
|
|
| ## Metadata |
|
|
| Each scene contains a `meta.json` with: |
|
|
| | Field | Description | |
| |-------|-------------| |
| | `scene` | Scene name | |
| | `ref_shutter` | Reference shutter speed (seconds) used for HDR normalization | |
| | `ref_shutter_fraction` | Human-readable, e.g. `"1/500"` | |
| | `hdr_method` | HDR merge algorithm (`triangular_weight_debevec1997`) | |
| | `alignment_method` | `life_optical_flow` or `cv2_sift_homography` | |
| | `gps` | `{latitude, longitude, altitude_m}` — available for 10 scenes | |
| | `photos[].shooting_time` | Capture timestamp from EXIF | |
| | `photos[].iso` | ISO speed | |
| | `photos[].shutter_speed` | Representative shutter speed (human-readable) | |
| | `envmaps[].shooting_time` | Capture timestamp | |
| | `envmaps[].shutter_speed` | Envmap shutter speed | |
|
|
| ## Scene List |
|
|
| GPS coordinates are provided as additional information. Since collecting GPS coordinates was not part of the original plan, only 10 scenes contain GPS coordinates. |
|
|
|
|
| | Scene | Time steps | Alignment | GPS | |
| |-------|-----------|-----------|-----| |
| | bench2 | 6 | LIFE flow | — | |
| | bench3 | 6 | LIFE flow | — | |
| | bike | 6 | LIFE flow | yes | |
| | bikes2 | 6 | LIFE flow | — | |
| | bridge | 6 | LIFE flow | — | |
| | building304 | 6 | LIFE flow | — | |
| | building324 | 7 | LIFE flow | — | |
| | byway | 6 | LIFE flow | yes | |
| | cabin | 6 | CV2/SIFT | — | |
| | corridor | 6 | LIFE flow | yes | |
| | foodtruck | 6 | LIFE flow | yes | |
| | garden | 6 | LIFE flow | — | |
| | grassland | 7 | LIFE flow | yes | |
| | grassland2 | 6 | LIFE flow | yes | |
| | indoor | 6 | CV2/SIFT | — | |
| | lake | 6 | LIFE flow | — | |
| | meadow | 6 | LIFE flow | — | |
| | parking | 7 | LIFE flow | — | |
| | pillar | 6 | LIFE flow | — | |
| | playground | 7 | LIFE flow | — | |
| | rail | 7 | LIFE flow | — | |
| | road | 7 | LIFE flow | — | |
| | sand | 6 | CV2/SIFT | — | |
| | seaside | 8 | CV2/SIFT | — | |
| | stairs | 6 | LIFE flow | yes | |
| | statue | 6 | LIFE flow | yes | |
| | statue2 | 6 | LIFE flow | yes | |
| | table_tennis | 6 | LIFE flow | yes | |
| | wall | 6 | LIFE flow | — | |
| | yatai | 7 | LIFE flow | — | |
| |
| |
| ## Temporal Alignment |
| |
| Photos are aligned to `time0` of each scene. Two methods are used depending on scene content: |
| |
| - **LIFE optical flow** (26 scenes): dense flow-based warping, handles gradual lighting changes and small camera motion |
| - **CV2/SIFT homography** (4 scenes: `cabin`, `indoor`, `sand`, `seaside`): feature-based homography, used when flow alignment fails due to detailed textures. |
| |
| Alignment is computed independently for `ori` and `small` resolutions. Environment maps are aligned using phase-correlation-based rotation estimation. |
| |
| ## License |
| |
| This dataset is released under the [Creative Commons Attribution 4.0 International (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/) license. |
| |
| ## Citation |
| |
| If you use this dataset, please cite: |
| |
| ```bibtex |
| @misc{wang2026wildrelight, |
| title={WildRelight: A Real-World Benchmark and Physics-Guided Adaptation for Single-Image Relighting}, |
| author={Lezhong Wang and Mehmet Onurcan Kaya and Siavash Bigdeli and Jeppe Revall Frisvad}, |
| year={2026}, |
| eprint={2605.11696}, |
| archivePrefix={arXiv}, |
| primaryClass={cs.CV}, |
| url={https://arxiv.org/abs/2605.11696}, |
| } |
| ``` |
| |
