Wavelet image denoising procedures. th = sigma* sqrt (2* log10 (L* T)) calculated threshold ch = c (1, num (4-i, 1): num (4-i, 3)+ step (4-i)-1) of the high-frequency coefficients thresholding chl = length (ch) for j = 1: chl if abs (ch (j))> = th ch (j) = sign (ch (j))* (abs (ch (j))-2* th/(1+ exp (m* (ch (j) ^ 2 )))) else threshold processing function

小波阈值图像去噪程序.doc

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