Real-time sub-pixel registration of imagery for an IR polarimeter

Jonathan B. Hanks; J. Larry Pezzaniti; David B. Chenault; João M. Romano

doi:10.1117/12.921039

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8 June 2012 Real-time sub-pixel registration of imagery for an IR polarimeter

Jonathan B. Hanks, J. Larry Pezzaniti, David B. Chenault, João M. Romano

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Proceedings Volume 8364, Polarization: Measurement, Analysis, and Remote Sensing X; 83640C (2012) https://doi.org/10.1117/12.921039
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

In imaging polarimetry, special consideration must be given to ensure proper spatial registration between frames. Edge artifacts caused by the differencing of unregistered frames has the potential to create significant spurious polarization signatures. To achieve 1/10^thpixel registration or better, a software based registration approach is often required. The focus of this paper is to present an efficient algorithm for real time sub-pixel registration in a division-of-time IR polarimeter based on a rotating polarizer. This algorithm has been implemented in a commercially available rotating polarizer LWIR imaging polarimeter offered by Polaris Sensor Technologies. This paper presents measurements of image nutation in a rotating polarizer LWIR imaging polarimeter and real-time registration of image data from that same polarimeter. The registration algorithm is based on an optimal 2D convolution. Examples of registered images are provided as well as estimates of residual misregistration artifacts.

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Jonathan B. Hanks, J. Larry Pezzaniti, David B. Chenault, and João M. Romano "Real-time sub-pixel registration of imagery for an IR polarimeter", Proc. SPIE 8364, Polarization: Measurement, Analysis, and Remote Sensing X, 83640C (8 June 2012); https://doi.org/10.1117/12.921039

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