qhjqhj00 6dof-visual-localization-eval
Benchmarking 6DOF Outdoor Visual Localization in Changing Conditions — Sattler et al. (2017) (arXiv:1707.09092, 2017)
What this evaluates
Evaluates a model's ability to estimate 6-degree-of-freedom camera poses for query images against a reference 3D model, specifically testing robustness to drastic changes in lighting (day/night), weather, and seasonal vegetation.
Datasets
- Aachen Day-Night — total ?; splits: test (-1)
- RobotCar Seasons — total ?; splits: test (-1)
- CMU Seasons — total ?; splits: test (-1)
Metrics
translation error and rotation error(primary) — range: [0, ∞) m / [0, 180] deg- Translation error is the Euclidean distance between the estimated and ground truth camera centers. Rotation error is the angle between the estimated and ground truth rotation matrices.
Input / output format
Input: Query image(s) and a reference 3D model (point cloud + reference camera poses/intrinsics).
Output: Estimated 6DOF camera pose (translation vector and rotation matrix) for each query image relative to the reference model.
Scoring recipe
def compute_pose_error(est_pose, gt_pose):
trans_err = np.linalg.norm(est_pose[:3, 3] - gt_pose[:3, 3])
rot_mat = est_pose[:3, :3] @ gt_pose[:3, :3].T
trace = np.trace(rot_mat)
rot_err = np.arccos(np.clip((trace - 1) / 2, -1, 1)) * 180 / np.pi
return trans_err, rot_err
Common pitfalls
- Ground truth poses for challenging conditions (night/seasons) are derived from hand-labeled 2D-3D matches or LIDAR/ICP alignment rather than direct SfM, which can introduce subtle inaccuracies.
- Reference models are constructed from a single environmental condition, requiring models to generalize across extreme appearance and geometric changes without condition-specific fine-tuning.
- Automotive datasets suffer from motion blur and auto-exposure artifacts that drastically reduce feature matchability compared to hand-held captures.
Evidence (verbatim from paper)
The final median RMS errors between aligned point clouds was under 0.10m in translation and 0.5∘ in rotation across all locations.
Citation
@misc{sattler2017benchmarking,
title={Benchmarking 6DOF Outdoor Visual Localization in Changing Conditions},
author={Sattler et al. (2017)},
year={2017},
note={arXiv:1707.09092}
}
- arXiv: 1707.09092