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Polarization calibration of fisheye cameras using skylight in the wild — arXiv:2611.08911

Source: arXiv (en)
Original: https://arxiv.org/abs/2611.08911
License (as archived): CC0-1.0
Archived: 2026-11-09T22:45:56.799Z
SHA-256 of the archived text: 2a2ec895b06d3338622c18e5cf58cf32ee6943ea719c61b86cf1310519e969d7
Stable URL of this page: https://metraipolis.com/documento/dc_281a68b4eef2

How to cite

Polarization calibration of fisheye cameras using skylight in the wild — arXiv:2611.08911 — arXiv (en), https://arxiv.org/abs/2611.08911 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_281a68b4eef2 (Metraipolis archive dc_281a68b4eef2, sha256 2a2ec895b06d3338622c18e5cf58cf32ee6943ea719c61b86cf1310519e969d7)

BibTeX

@misc{dc281a68b4eef2,
  title = {Polarization calibration of fisheye cameras using skylight in the wild — arXiv:2611.08911},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.08911},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_281a68b4eef2; sha256 2a2ec895b06d3338622c18e5cf58cf32ee6943ea719c61b86cf1310519e969d7},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.08911. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Skylight polarization provides directional cues for robotic navigation, but fisheye lens effects and analyzer imperfections can degrade polarization measurements across the field of view. We present a joint lens-analyzer calibration method that explicitly models incidence-dependent lens transmission together with analyzer gains and angular offsets in a unified eight-parameter formulation. Given known geometric calibration, rotations between camera frames can be estimated using visual features and cross-frame directional polarized light consistency can be used for polarization calibration. Therefore, our calibration approach requires only a short handheld outdoor sequence under natural skylight, without dedicated polarization calibration equipment or a predefined sky polarization model. On real-world outdoor sequences, the proposed method achieves a weighted cross-frame angle-of-linear-polarization (AoLP) mean absolute error below 0.5° across all incidence angles, with a 73.4% reduction in the 80°-90° incidence angle region, and generalizes to an independent sequence with an overall mean absolute error of 0.466° without refitting. Preliminary solar-azimuth experiments using a camera mounted on a quadruped robot further show improved alignment with the visible solar center, supporting the potential of calibrated AoLP measurements for relative-heading estimation and future polarization--inertial navigation. The calibration software tool will be released upon acceptance of this paper.

Tema degli esploratori: statistica e scienza dei dati (elenco arXiv cs.RO, nuovi lavori del giorno).
Categorie arXiv: Robotics (cs.RO).
Pagina del lavoro: https://arxiv.org/abs/2611.08911 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-09T22:38:02.168Z dalla pagina https://arxiv.org/list/cs.RO/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).