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Edge-Preserving Filtering of Images with Low Photon Counts

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4 Author(s)
Lee, J.A. ; Mol. Imaging & Exp. Radioherapy Unit (IMRE), Univ. Catholique de Louvain, Brussels ; Geets, X. ; Gregoire, V. ; Bol, A.

Edge-preserving filters such as local M-smoothers or bilateral filtering are usually designed for Gaussian noise. This paper investigates how these filters can be adapted in order to efficiently deal with Poissonian noise. In addition, the issue of photometry invariance is addressed by changing the way filter coefficients are normalized. The proposed normalization is additive, instead of being multiplicative, and leads to a strong connection with anisotropic diffusion. Experiments show that ensuring the photometry invariance leads to comparable denoising performances in terms of the root mean square error computed on the signal.

Published in:

Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:30 ,  Issue: 6 )

Date of Publication:

June 2008

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