DocumentCode :
1122402
Title :
On the estimation of the coefficient of variation for anisotropic diffusion speckle filtering
Author :
Aja-Fernández, Santiago ; Alberola-López, Carlos
Author_Institution :
Ingenieros de Telecomunicacion, Valladolid Univ.
Volume :
15
Issue :
9
fYear :
2006
Firstpage :
2694
Lastpage :
2701
Abstract :
In this paper, we focus on the problem of speckle removal by means of anisotropic diffusion and, specifically, on the importance of the correct estimation of the statistics involved. First, we derive an anisotropic diffusion filter that does not depend on a linear approximation of the speckle model assumed, which is the case of a previously reported filter, namely, SRAD. Then, we focus on the problem of estimation of the coefficient of variation of both signal and noise and of noise itself. Our experiments indicate that neighborhoods used for parameter estimation do not need to coincide with those used in the diffusion equations. Then, we show that, as long as the estimates are good enough, the filter proposed here and the SRAD perform fairly closely, a fact that emphasizes the importance of the correct estimation of the coefficients of variation
Keywords :
filtering theory; image denoising; parameter estimation; speckle; SRAD; anisotropic diffusion speckle filtering; coefficient of variation estimation; diffusion equations; parameter estimation; speckle removal; Additive noise; Anisotropic magnetoresistance; Equations; Filtering; Image enhancement; Noise reduction; Nonlinear filters; Speckle; Statistics; Ultrasonic imaging; Anisotropic diffusion; coefficient of variation; image restoration; speckle filtering; statistics estimation;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/TIP.2006.877360
Filename :
1673450
Link To Document :
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