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Proceedings Article

Blind deconvolution approach for resolution enhancement of near-field microwave images

[+] Author Affiliations
Ali Mohammad-Djafari

Lab. des Signaux et Systemes (France)

Nasser Qaddoumi, Reza Zoughi

Colorado State Univ. (USA)

Proc. SPIE 3816, Mathematical Modeling, Bayesian Estimation, and Inverse Problems, 274 (June 25, 1999); doi:10.1117/12.351322
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From Conference Volume 3816

  • Mathematical Modeling, Bayesian Estimation, and Inverse Problems
  • Francoise J. Preteux; Ali Mohammad-Djafari; Edward R. Dougherty
  • Denver, CO | July 18, 1999

abstract

In this paper we propose a blind deconvolusion method to enhance the resolution of images obtained by near-field microwave nondestructive techniques using an open ended rectangular waveguide probe. In fact, we model such imags to be the result of a convolution of the real input images with a point spread function (PSF). This PSF depends mainly on the dimensions of the waveguide, the operating frequency, the nature of the object under test and standoff distance between the waveguide and the object. Unfortunately, it is very difficult to model this PSF from the physical data. For this reason, we consider the problem as a blind deconvolution. The proposed method is based on regularization, and the solution is obtained iteratively, by successive estimation of the input and the PSF. The algorithm is initialized with a PSF obtained from a very simplified physical model. The performance of the proposed method is evaluated on some real data. Several examples of real image enhancement will be presented.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Ali Mohammad-Djafari ; Nasser Qaddoumi and Reza Zoughi
"Blind deconvolution approach for resolution enhancement of near-field microwave images", Proc. SPIE 3816, Mathematical Modeling, Bayesian Estimation, and Inverse Problems, 274 (June 25, 1999); doi:10.1117/12.351322; http://dx.doi.org/10.1117/12.351322


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