  The Near-IR Imaging Spectropolarimeter (NIRIS) is a polarimeter that is
installed at the New Solar Telescope at Big Bear Solar Observatory. This
instrument takes advantages of the highest spatial resolution and flux. The
primary mirror is an on-axis type, so it was our interest to evaluate its
contribution to the crosstalk among the Stokes parameters since we could not
put our calibration optics before the mirror. We would like to present our
efforts to compensate for the crosstalk among Stokes profiles caused by the
relay optics from the telescope to the detector. The overall data processing
pipeline is also introduced.
