Planar Nuclear Medicine Images De-Noising Via Wavelet Block Thresholding: a Simulation Study
نویسندگان
چکیده
منابع مشابه
Quantitative Assessment of Conventional and Modern De-Noising on Nuclear Medicine Images
Introduction: One of the major problems in the development of nuclear medicine images is the presence of noise. The noise level in nuclear medicine images is usually reduced by the analysis of imaging data in a Fourier transform environment. The main drawback of this environment belongs to low signal to noise ratio in high frequencies because removing noise frequencies may remove data and times...
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Donoho and Johnstone (1992a) proposed a method for reconstructing an unknown function f on [0; 1] from noisy data di = f(ti) + zi, i = 0; : : : ; n 1, ti = i=n, zi iid N(0; 1). The reconstruction f̂ n is de ned in the wavelet domain by translating all the empirical wavelet coe cients of d towards 0 by an amount p 2 log(n) = p n. We prove two results about that estimator. [Smooth]: With high prob...
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ژورنال
عنوان ژورنال: British Journal of Applied Science & Technology
سال: 2013
ISSN: 2231-0843
DOI: 10.9734/bjast/2013/2696