Controlling the Gibbs phenomenon in noisy deconvolution of irregular multivariable input signals. (2000)

• Record Type: Journal Article
• Authors: Chandrawansa, Kumari; Ruymgaart, Frits H.; Van Rooij, Arnoud C. M.
• Is Part Of: Journal of applied mathematics and stochastic analysis. Volume 13:Number 1(2000)
• Page Start: 1
• Page End: 14
• Publication Date: 2000
• Subjects: deconvolution -- irregular multivariable input signals -- Gibbs phenomenon -- overshooting -- Cesàro integral means -- Hausdorff metric -- speed of convergence; Mathematical models -- Periodicals; Computer simulation -- Periodicals; Computer science -- Mathematics -- Periodicals; Computer science -- Mathematics; Computer simulation; Mathematical models; Applied Mathematics; Periodicals; Electronic journals; 519.22
• DOI: 10.1155/S1048953300000010
• Languages: English
• ISSNs: 1048-9533

Abstract

Abstract : An example of inverse estimation of irregular multivariable signals is provided by picture restoration. Pictures typically have sharp edges and therefore will be modeled by functions with discontinuities, and they could be blurred by motion. Mathematically, this means that we actually observe the convolution of the irregular function representing the picture with a spread function. Since these observations will contain measurement errors, statistical aspects will be pertinent. Traditional recovery is corrupted by the Gibbs phenomenon (i.e., overshooting) near the edges, just as in the case of direct approximations. In order to eliminate these undesirable effects, we introduce an integral Cesàro mean in the inversion procedure, leading to multivariable Fejér kernels. Integral metrics are not sufficiently sensitive to properly assess the quality of the resulting estimators. Therefore, the performance of the estimators is studied in the Hausdorff metric, and a speed of convergence of the Hausdorff distance between the graph of the input signal and its estimator is obtained.