Fig. 1. Schematic of three-beam simultaneous polarization imaging system

Fig. 2. Calculation results of polarization measurement errors caused by various error sources of beam splitting polarization imaging system. (a) Polarizer oriented angle error a_k; (b) light divided ratio error b_k; (c) transmissivity non-uniformity error c_k; (d) radiation responsivity non-uniformity error d_i,j,k; (e) pixel offset e_k

Fig. 3. Calculation results of polarization angle measurement errors caused by various error sources of beam splitting polarization imaging system. (a) Polarizer oriented angle error a_k; (b) light divided ratio error b_k; (c) transmissivity non-uniformity error c_k; (d) radiation responsivity non-uniformity error d_i,j,k; (e) pixel offset e_k

Fig. 4. Flow chart of pre-processing calibration for beam splitting simultaneous polarization imaging system

Fig. 5. Calibration system of CCD non-uniformity. (a) Schematic diagram; (b) physical graph

Fig. 6. Three-channel original image pixel value. (a) Image of 0° polarizer; (b) image of 45° polarizer; (c) image of 90° polarizer

Fig. 7. Three-channel image pixel value after uniformity correction. (a) Image of 0° polarizer; (b) image of 45° polarizer; (c) image of 90° polarizer

Fig. 8. Three-channel radiation response difference calibration system. (a) Schematic diagram; (b) physical graph

Fig. 9. Calibration system for polarizer oriented angle. (a) Schematic diagram; (b) physical graph

Fig. 10. Fitting curves of pixel values of different polarized angles. (a) 0° polarization channel; (b) 45° polarization channel; (c) 90° polarization channel

Fig. 11. Comparison of polarization degree measurement error before and after correction for amplitude divided imaging polarimeter. (a) Before correction; (b) after correction

Fig. 12. Comparison of polarization angle measurement error before and after correction for amplitude divided imaging polarimeter. (a) Before correction; (b) after correction

Fig. 13. Stokes parameter images after preprocessing. (a) Image of I parameter; (b) image of Q parameter; (c) image of U parameter; (d) image of polarization degree; (e) image of polarized angle

Fig. 14. Comparison between original image and polarization fusion image. (a) Original image; (b) polarization fusion image

Table 1. Polarization imaging system parameters

Table 2. Non-uniformity σ of three-channel original imageunit: %

Table 3. Non-uniformity σ of three-channel image after uniformity correctionunit: %

Table 4. Three-channel image average after radiation response uniformity correction

Table 5. Relative difference ratio of average DN of 3 channel images before and after radiation responsivity uniformity correctionunit: %

Table 6. Measuring results of polarizer oriented angles

Table 7. Calibration values of system errors