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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 12 — Dec. 1, 2001
  • pp: 3049–3060

Statistical algorithms for target detection in coherent active polarimetric images

François Goudail and Philippe Réfrégier  »View Author Affiliations


JOSA A, Vol. 18, Issue 12, pp. 3049-3060 (2001)
http://dx.doi.org/10.1364/JOSAA.18.003049


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Abstract

We address the problem of small-target detection with a polarimetric imager that provides orthogonal state contrast images. Such active systems allow one to measure the degree of polarization of the light backscattered by purely depolarizing isotropic materials. To be independent of the spatial nonuniformities of the illumination beam, small-target detection on the orthogonal state contrast image must be performed without using the image of backscattered intensity. We thus propose and develop a simple and efficient target detection algorithm based on a nonlinear pointwise transformation of the orthogonal state contrast image followed by a maximum-likelihood algorithm optimal for additive Gaussian perturbations. We demonstrate the efficiency of this suboptimal technique in comparison with the optimal one, which, however, assumes a priori knowledge about the scene that is not available in practice. We illustrate the performance of this approach on both simulated and real polarimetric images.

© 2001 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(100.0100) Image processing : Image processing
(100.5010) Image processing : Pattern recognition
(260.5430) Physical optics : Polarization

History
Original Manuscript: February 9, 2001
Revised Manuscript: June 4, 2001
Manuscript Accepted: June 5, 2001
Published: December 1, 2001

Citation
François Goudail and Philippe Réfrégier, "Statistical algorithms for target detection in coherent active polarimetric images," J. Opt. Soc. Am. A 18, 3049-3060 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-12-3049

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