## Total least-squares reconstruction with wavelets for optical tomography

JOSA A, Vol. 15, Issue 10, pp. 2639-2650 (1998)

http://dx.doi.org/10.1364/JOSAA.15.002639

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### Abstract

In a previous paper [Zhu, J. Opt. Soc. Am. A 14, 799 (1997)] an iterative algorithm for obtaining the total least-squares (TLS) solution of a linear system based on the Rayleigh quotient formulation was presented. Here we derive what to our knowledge are the first statistical properties of this solution. It is shown that the Rayleigh-quotient-form TLS (RQF-TLS) estimator is equivalent to the maximum-likelihood estimator when noise terms in both data and operator elements are independent and identically distributed Gaussian. A perturbation analysis of the RQF-TLS solution is derived, and from it the mean square error of the RQF-TLS solution is obtained in closed form, which is valid at small noise levels. We then present a wavelet-based multiresolution scheme for obtaining the TLS solution. This method was employed with a multigrid algorithm to solve the linear perturbation equation encountered in optical tomography. Results from numerical simulations show that this method requires substantially less computation than the previously reported one-grid TLS algorithm. The method also allows one to identify regions of interest quickly from a coarse-level reconstruction and restrict the reconstruction in the following fine resolutions to those regions. Finally, the method is less sensitive to noise than the one-grid TLS and multigrid least-squares algorithms.

© 1998 Optical Society of America

**OCIS Codes**

(100.0100) Image processing : Image processing

(100.2000) Image processing : Digital image processing

(100.3010) Image processing : Image reconstruction techniques

(100.3190) Image processing : Inverse problems

(100.6950) Image processing : Tomographic image processing

(100.7410) Image processing : Wavelets

**History**

Original Manuscript: March 19, 1998

Revised Manuscript: June 10, 1998

Manuscript Accepted: May 11, 1998

Published: October 1, 1998

**Citation**

Wenwu Zhu, Yao Wang, and Jun Zhang, "Total least-squares reconstruction with wavelets for optical tomography," J. Opt. Soc. Am. A **15**, 2639-2650 (1998)

http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-15-10-2639

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