Active imaging systems that illuminate a scene with polarized light and acquire two images in two orthogonal polarizations yield information about the intensity contrast and the orthogonal state contrast (OSC) in the scene. Both contrasts are relevant for target detection. However, in real systems, the illumination is often spatially or temporally nonuniform. This creates artificial intensity contrasts that can lead to false alarms. We derive generalized likelihood ratio test (GLRT) detectors, for which intensity information is taken into account or not and determine the relevant expressions of the contrast in these two situations. These results are used to determine in which cases considering intensity information in addition to polarimetric information is relevant or not.
© 2009 Optical Society of America
(030.4280) Coherence and statistical optics : Noise in imaging systems
Original Manuscript: January 14, 2009
Manuscript Accepted: April 25, 2009
Published: June 24, 2009
Arnaud Bénière, François Goudail, Daniel Dolfi, and Mehdi Alouini, "Target detection in active polarization images perturbed with additive noise and illumination nonuniformity," J. Opt. Soc. Am. A 26, 1678-1686 (2009)