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.
hf download lez/wildrelight --repo-type dataset --include "small-aligned/**" --local-dir ./wildrelight/small-aligned
Download full resolution dataset.
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) license.
Citation
If you use this dataset, please cite:
@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},
}