Motion-based nonuniformity correction in DoFP polarimeters

Rakesh Kumar, J. Scott Tyo, Bradley M. Ratliff

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Division of Focal Plane polarimeters (DoFP) operate by integrating an array of micropolarizer elements with a focal plane array. These devices have been investigated for over a decade, and example systems have been built in all regions of the optical spectrum. DoFP devices have the distinct advantage that they are mechanically rugged, inherently temporally synchronized, and optically aligned. They have the concomitant disadvantage that each pixel in the FPA has a different instantaneous field of view (IFOV), meaning that the polarization component measurements that go into estimating the Stokes vector across the image come from four different points in the field. In addition to IFOV errors, microgrid camera systems operating in the LWIR have the additional problem that FPA nonuniformity (NU) noise can be quite severe. The spatial differencing nature of a DoFP system exacerbates the residual NU noise that is remaining after calibration, and is often the largest source of false polarization signatures away from regions where IFOV error dominates. We have recently presented a scene based algorithm that uses frame-to-frame motion to compensate for NU noise in unpolarized IR imagers. In this paper, we have extended that algorithm so that it can be used to compensate for NU noise on a DoFP polarimeter. Furthermore, the additional information provided by the scene motion can be used to significantly reduce the IFOV error. We have found a reduction of IFOV error by a factor of 10 if the scene motion is known exactly. Performance is reduced when the motion must be estimated from the scene, but still shows a marked improvement over static DoFP images.

Original languageEnglish (US)
Title of host publicationPolarization Science and Remote Sensing III
DOIs
StatePublished - Dec 1 2007
EventPolarization Science and Remote Sensing III - San Diego, CA, United States
Duration: Aug 29 2007Aug 30 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6682
ISSN (Print)0277-786X

Other

OtherPolarization Science and Remote Sensing III
CountryUnited States
CitySan Diego, CA
Period8/29/078/30/07

Keywords

  • Division of focal plane
  • Focal plane array
  • Imaging polarimeter
  • Instantaneous field of view
  • Microgrid sensor
  • Spatial nonuniformity
  • Superresolution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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