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A systematic way of data reduction for the Nishiharima Infrared Camera (NIC)polarimetry mode has been devised and implemented to an open software calledNICpolpy in the programming language python (tested on version 3.8--3.10 as ofwriting). On top of the classical methods, including vertical pattern removal,a new way of diagonal pattern (Fourier pattern) removal has been implemented.Each image undergoes four reduction steps, resulting in "level 1" to "level 4"products, as well as nightly calibration frames. A simple tutorial and in-depthdescriptions are provided, as well as the descriptions of algorithms. The domeflat frames (taken on UT 2020-06-03) were analyzed, and the pixel positionsvulnerable to flat error were found. Using the dark and flat frames, thedetector parameters, gain factor (the conversion factor), and readout noise arealso updated. We found gain factor and readout noise are likely constants overpixel or "quadrant".

Data Reduction Process and Pipeline for the NIC Polarimetry Mode in Python, NICpolpy