MATLAB——多层小波的重构

程高兴2023-11-02 10:15

%% 学习目标：多层小波的重构

%% 程序1

clear all;

close all;

load noissin.mat;

x=noissin;

C,L\]=wavedec(x,3,'db1'); %小波多层分解 y=waverec(C,L,'db1'); %重构，必须小波类型一致 e=max(abs(x-y)) %重构的误差 %% 程序2 clear all; close all; load noissin.mat; x=noissin; \[C,L\]=wavedec(x,3,'db1'); %3层小波分解 A=wrcoef('a',C,L,'db1'); %对近似系数进行单支重构，去掉了高频部分 D1=wrcoef('d',C,L,'db1',1); %对细节系数进行单支重构 D2=wrcoef('d',C,L,'db1',2); D3=wrcoef('d',C,L,'db1',3); figure; subplot(511); plot(x); subplot(512); plot(A); subplot(513); plot(D1); subplot(514); plot(D2); subplot(515); plot(D3); set(gcf,'position',\[50,50,800,600\]);![](https://file.jishuzhan.net/article/1719901055455596546/5cab77ba0c3c2087257d9bb81590759c.webp)