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README.md

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----
-license: cc-by-4.0
----
+---
+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.
+
+## 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
+@inproceedings{wildrelight2026,
+  title     = {TODO},
+  author    = {TODO},
+  booktitle = {TODO},
+  year      = {2026},
+}
+``` -->