  Division-of-focal-plane modulation is a powerful technique for real-time
polarization imaging. This technique, however, suffers from the non-uniformity
of the performance of linear polarization filters and photodetectors. We study
the Stokes parameters reconstruction from the division-of-focal-plane
modulation in the presence of the non-uniformity. Two reconstruction methods,
named as least-squares and smoothing regularization methods, are proposed. The
performance of the proposed methods are evaluated through Fourier analysis,
numerical simulations, and experiments. The results indicate that the proposed
methods can effectively mitigate the reconstruction errors and artifacts caused
by the non-uniformity, and therefore may further facilitate the practical
application of the division-of-focal-plane technique.
