Polarization calibration of fisheye cameras using skylight in the wild
Polarization calibration of fisheye cameras using skylight in the wild
This paper presents a joint lens-analyzer calibration method for fisheye cameras that explicitly models incidence-dependent lens transmission, analyzer gains, and angular offsets.
The authors propose a joint lens-analyzer calibration method for fisheye cameras that models incidence-dependent transmission and analyzer imperfections, achieving a weighted mean absolute error below 0.5 degrees on outdoor sequences without dedicated equipment or predefined sky models.
Source: arXiv Robotics — research abstracts · Read original article ↗
Loading article text…
What the source reports
Publisher-reported claims, with original evidence. These results have not been independently verified by RoboSignal.
Reported numbers
mean absolute error
<0.5
View original evidence
del. On real-world outdoor sequences, the proposed method achieves a weighted cross-frame angle-of-linear-polarization (AoLP) mean absolute error below 0.5{\deg} across all incidence angles, with a 73.4% reduction in the 80{\deg}-90{\deg} incidence angle region, and generalizes to an independent sequence with an overall mean absolute error of 0.466{\deg} without refitting. Preliminary solar-azimuth experiments using
Open source S4mean absolute error
0.466
View original evidence
del. On real-world outdoor sequences, the proposed method achieves a weighted cross-frame angle-of-linear-polarization (AoLP) mean absolute error below 0.5{\deg} across all incidence angles, with a 73.4% reduction in the 80{\deg}-90{\deg} incidence angle region, and generalizes to an independent sequence with an overall mean absolute error of 0.466{\deg} without refitting. Preliminary solar-azimuth experiments using
Open source S4
- paper: Reported pending Open source S5
- paper: not_reported
Source excerpts and review record
Automatically extracted; no manual editorial approval recorded.
del. On real-world outdoor sequences, the proposed method achieves a weighted cross-frame angle-of-linear-polarization (AoLP) mean absolute error below 0.5{\deg} across all incidence angles, with a 73.4% reduction in the 80{\deg}-90{\deg} incidence angle region, and generalizes to an independent sequence with an overall mean absolute error of 0.466{\deg} without refitting. Preliminary solar-azimuth experiments using
Open source S4
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.
Open source S5
Source：arXiv Robotics — research abstracts · arxiv.org