Simultaneous Accurate Polarization Measurement with Three Wavelengths with a Color Polarization Camera

Polarimetric color cameras are a forefront technology that simultaneously capture polarimetric and color information by analyzing polarization states across different color channels, commonly red, green, and blue. In general, each of these color channels can carry different polarization information. Therefore, measuring the polarization Stokes vector at several discrete wavelengths simultaneously and with the highest possible resolution is of interest in multiple research areas. Nonetheless, this situation has not yet been investigated in specialized literature, where it is still commonly assumed that all color channels transport the same polarization information. In practice, polarimetric color cameras often come with the difficulty of color filter overlapping. For instance, the green filter partially transmits red and blue wavelengths, causing polarization-color crosstalk. In this work, we present a method to solve this problem. In addition, Fourier domain demosaicing techniques are applied to interpolate the data and reconstruct the images. The present study demonstrates how the proposed method leads to a successful recovery of chromatic and polarimetric information on both synthetic and real-world datasets. To test our approach, narrowband light beams at three wavelengths (470, 554, 630 nm), with different spatial polarization and degree of linear polarization distributions have been simulated and validated with experimental data. The results demonstrate the feasibility of the method for accurate three polarization channels measurements.