?? valsurethresh.m
字號:
function thresh = ValSUREThresh(x)
% ValSUREThresh -- Adaptive Threshold Selection Using Principle of SURE
% Usage
% thresh = ValSUREThresh(y)
% Inputs
% y Noisy Data with Std. Deviation = 1
% Outputs
% thresh Value of Threshold
%
% Description
% SURE referes to Stein's Unbiased Risk Estimate.
%
a = sort(abs(x)).^2 ;
b = cumsum(a);
n = length(x);
c = linspace(n-1,0,n);
s = b+c.*a;
risk = (n - ( 2 .* (1:n )) + s)/n;
[guess,ibest] = min(risk);
thresh = sqrt(a(ibest));
%
% Copyright (c) 1993-5. Jonathan Buckheit, David Donoho and Iain Johnstone
%
%% Part of Wavelab Version 850% Built Tue Jan 3 13:20:40 EST 2006% This is Copyrighted Material% For Copying permissions see COPYING.m% Comments? e-mail wavelab@stat.stanford.edu
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -