PMID: 15376595Sep 21, 2004Paper

Adaptive alpha-trimmed mean filters under deviations from assumed noise model

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
Remzi Oten, Rui J P de Figueiredo

Abstract

Alpha-trimmed mean filters are widely used for the restoration of signals and images corrupted by additive non-Gaussian noise. They are especially preferred if the underlying noise deviates from Gaussian with the impulsive noise components. The key design issue of these filters is to select its only parameter, alpha, optimally for a given noise type. In image restoration, adaptive filters utilize the flexibility of selecting alpha according to some local noise statistics. In the present paper, we first review the existing adaptive alpha-trimmed mean filter schemes. We then analyze the performance of these filters when the underlying noise distribution deviates from the Gaussian and does not satisfy the assumptions such as symmetry. Specifically, the clipping effect and the mixed noise cases are analyzed. We also present a new adaptive alpha-trimmed filter implementation that detects the nonsymmetry points locally and applies alpha-trimmed mean filter that trims out the outlier pixels such as edges or impulsive noise according to this local decision. Comparisons of the speed and filtering performances under deviations from symmetry and Gaussian assumptions show that the proposed filter is a very good alternative to the existing ...Continue Reading

Citations

Aug 28, 2012·IEEE Transactions on Systems, Man, and Cybernetics. Part B, Cybernetics : a Publication of the IEEE Systems, Man, and Cybernetics Society·Yicong ZhouC L Philip Chen
Nov 2, 2006·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Tuncer Can Aysal, Kenneth E Barner
Oct 25, 2011·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Xudong Jiang
Apr 21, 2019·Medical Physics·Juan P Cruz-BastidaGuang-Hong Chen
Apr 9, 2020·Sensors·Bruna G PalmHans Hellsten
Dec 28, 2016·Journal of Digital Imaging·Nishant Jain, Vinod Kumar

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