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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. 22, Iss. 4 — Apr. 1, 2005
  • pp: 604–615

Image recovery under nonlinear and non-Gaussian degradations

S. I. Sadhar and A. N. Rajagopalan  »View Author Affiliations


JOSA A, Vol. 22, Issue 4, pp. 604-615 (2005)
http://dx.doi.org/10.1364/JOSAA.22.000604


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Abstract

A new two-dimensional recursive filter for recovering degraded images is proposed that is based on particle-filter theory. The main contribution of this work lies in evolving a framework that has the potential to recover images suffering from a general class of degradations such as system nonlinearity and non-Gaussian observation noise. Samples of the prior probability distribution of the original image are obtained by propagating the samples through an appropriate state model. Given the measurement model and the degraded image, the weights of the samples are computed. The samples and their corresponding weights are used to calculate the conditional mean that yields an estimate of the original image. The proposed method is validated by demonstrating its effectiveness in recovering images degraded by film-grain noise. Synthetic as well as real examples are considered for this purpose. Performance is also compared with that of an existing scheme.

© 2005 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.3020) Image processing : Image reconstruction-restoration

History
Original Manuscript: April 12, 2004
Revised Manuscript: August 3, 2004
Manuscript Accepted: August 3, 2004
Published: April 1, 2005

Citation
S. I. Sadhar and A. N. Rajagopalan, "Image recovery under nonlinear and non-Gaussian degradations," J. Opt. Soc. Am. A 22, 604-615 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-4-604


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