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Optical Engineering

Vector space methods for sensor fusion problems
Author(s): Nageswara S. V. Rao
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Paper Abstract

In a multiple sensor system, the sensor Sj , j=1,2, . . . ,N, outputs Y( j )?R in response to input X?[0,1], according to an unknown probability distribution PY(j )|X . The problem is to estimate a fusion function f:RN?[0,1], based on a training sample, such that the expected square error is minimized over a family of functions F that constitutes a finite-dimensional vector space. The function f* that exactly minimizes the expected error cannot be computed since the underlying distributions are unknown, and only an approximation f to f* is feasible. We estimate the sample size sufficiently to ensure that an estimator f that minimizes the empirical square error provides a close approximation to f* with a high probability. The advantages of vector space methods are twofold: (1) the sample size estimate is a simple function of the dimensionality of F and (2) the estimate f can be easily computed by the well-known least square methods in polynomial time. The results are applicable to the classical potential function method as well as to a recently proposed class of sigmoidal feedforward neural networks.

Paper Details

Date Published: 1 February 1998
PDF: 6 pages
Opt. Eng. 37(2) doi: 10.1117/1.601638
Published in: Optical Engineering Volume 37, Issue 2
Show Author Affiliations
Nageswara S. V. Rao, Oak Ridge National Lab. (United States)


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