vmd图像去噪代码matlab
时间: 2023-07-02 22:16:33 浏览: 104
以下是一个简单的 vmd 去噪的 Matlab 代码示例:
```matlab
function [y, f] = vmd_denoise(x, N, J, tau, dc, init)
% Inputs:
% - x: input signal
% - N: number of modes
% - J: number of iterations
% - tau: time-step
% - dc: dc bias removal (true/false)
% - init: initialization (default: zero-mean)
%
% Outputs:
% - y: denoised signal
% - f: VMD components
% Initialization
if nargin < 6
init = 'zero_mean';
end
if nargin < 5
dc = false;
end
% DC bias removal
if dc
x = x - mean(x);
end
% VMD parameters
alpha = 2000; % moderate bandwidth constraint
tau = tau; % time-step
K = 100; % 100th order butterworth filter
DC = 0; % no DC part imposed
init = init; % select initialization
% VMD
[f, ~] = VMD(x, alpha, tau, K, DC, init, J, N, 0);
% Denoised signal
y = sum(f, 1);
% Frequency axis
NFFT = 2^nextpow2(length(x));
f = linspace(0, 1, NFFT/2+1)*1/tau/2;
```
在上面的代码中,VMD 函数是一个自己编写的函数,用于计算变分模态分解。如果您需要使用该代码,请首先将其保存为名为 "VMD.m" 的单独文件,并将其添加到 Matlab 的搜索路径中。
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