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Division of Focal plane imagers have recently been developed for polarimetric imaging. Those sensors use a grid composed of four different pixels with four different polarizers engraved on them. Four of these different pixels form a superpixel which enables the estimation of the linear Stokes vector with a single acquisition. Those sensors are particularly sensitive to the spatial variations of the scene. Therefore, if such variations are non-negligible compared with the measurement noise, the estimation of the state of polarization is corrupted. We propose a method to map the superpixels in which the estimation can be trusted.
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Benjamin Le Teurnier, Matthieu Boffety, François Goudail, "Error mapping in DOFP Stokes images and its use for retardance calibration," Proc. SPIE 12112, Polarization: Measurement, Analysis, and Remote Sensing XV, 1211207 (30 May 2022); https://doi.org/10.1117/12.2621616