Fig. 1. Positional relationship between camera and polarizer. (a) Three dimensional coordinate relationship between polarizer and camera; (b) two dimensional coordinate relationship between polarizer and camera

Fig. 2. Information comparison of polarization angle between measured and simulated data

Fig. 3. Influence of deviation angle σ on distribution of polarization angle

Fig. 4. Effect of deviation angle σ on distribution of polarization angle. (a) Variation rule of distribution of polarization angle when deviation angle σ changes from 0° to 10°; (b) distribution of polarization angle when deviation angle σ changes from 0° to 180°

Fig. 5. Error curves of solar azimuth angle affected by deviation angle σ. (a) Error curve of solar azimuth angle when deviation angle σ changes from 0° to 10°; (b) error curve of solar azimuth angle when deviation angle σ changes from 0° to 180°

Fig. 6. Identification results of neutral points. (a) Ellipse fitting of region of neutral points; (b) neutral point identification of distribution of degree of polarization; (c) neutral point identification of distribution of angle of polarization

Fig. 7. HS results. (a) Initialized HM; (b) iterative search results

Fig. 8. Flow chart of algorithm

Fig. 9. Distributions of polarized skylight patten at different deviation angle σ

Fig. 10. Corrected results of polarization angle and error analysis. (a) Results of polarization angle correction; (b) difference between real polarization angle and corrected polarization angle

Fig. 11. Correction results at different deviation angle σ. (a) Error curves of correction for different deviation angle σ; (b) information similarity curves of polarization angle after correction

Fig. 12. Comparison of correction results at different deviation angle σ at 7:00 and 17:00

Fig. 13. Correction results of polarization angle information using correction angle at 7:00