matlab 求分层阈值函数
本帖最后由 wdhd 于 2016-9-20 13:29 编辑function = wdcbm(c,l,alpha,m)
% Check arguments.
nbIn = nargin;
if nbIn < 3
error('Not enough input arguments.');
end
if errargt(mfilename,alpha-1,'rep'), error('*'), end
if nbIn==4
if errargt(mfilename,m-1,'rep'), error('*'), end
else
m = l(1);
end
m = max(m,1);
J = length(l)-2; % low frequency cutoff.
thr = zeros(1,J);
nkeep = zeros(1,J);
% Wavelet coefficients selection.
for j=1:J
% number of coefs to be kept.
n = m/(J+2-j)^alpha;
n = min(round(n),l(J-j+2));
% threshold.
if n == l(J-j+2)
thr(j) = 0;
else
d = detcoef(c,l,j);
d = sort(abs(d));
thr(j) = d(end-n);
end
nkeep(j) = n;
end
请问红色代码的用意是什么?看不懂，谢谢大家
页:
[1]