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Proceedings Paper

Blind deconvolution approach for resolution enhancement of near-field microwave images
Author(s): Ali Mohammad-Djafari; Nasser Qaddoumi; Reza Zoughi
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Paper 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.

Paper Details

Date Published: 25 June 1999
PDF: 8 pages
Proc. SPIE 3816, Mathematical Modeling, Bayesian Estimation, and Inverse Problems, (25 June 1999); doi: 10.1117/12.351322
Show Author Affiliations
Ali Mohammad-Djafari, Lab. des Signaux et Systemes (France)
Nasser Qaddoumi, Colorado State Univ. (United States)
Reza Zoughi, Colorado State Univ. (United States)


Published in SPIE Proceedings Vol. 3816:
Mathematical Modeling, Bayesian Estimation, and Inverse Problems
Françoise J. Prêteux; Ali Mohammad-Djafari; Edward R. Dougherty, Editor(s)

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