SVD圖片有損壓縮測試

注意文件名別保持成svd.m，這樣與系統的默認svd程序衝突

圖片處理函數生成的三組二維數組對應RGB，處理時保留一組

clear all; close all; clc; a1=imread('C:\1.jpg'); [m n]=size(a1); a1=double(a1); a=a1(:,:,3); %圖片有三個通道 imshow(mat2gray(a)) r=rank(a); [U S V]=svd(a); %re=s*v*d';
re=U(:,:)*S(:,1:1)*V(:,1:1)';
figure; imshow(mat2gray(re)); imwrite(mat2gray(re),'a.jpg') %實際保存是S能夠只保存20個字節,U,V按二維數組保存 re=U(:,1:20)*S(1:20,1:20)*V(:,1:20)';
figure; imshow(mat2gray(re)); imwrite(mat2gray(re),'b.jpg') re=U(:,1:80)*S(1:80,1:80)*V(:,1:80)';
figure; imshow(mat2gray(re)); imwrite(mat2gray(re),'c.jpg') re=U(:,1:150)*S(1:150,1:150)*V(:,1:150)';
figure; imshow(mat2gray(re)); imwrite(mat2gray(re),'d.jpg') re=U(:,1:250)*S(1:250,1:250)*V(:,1:250)';
figure; imshow(mat2gray(re)); imwrite(mat2gray(re),'e.jpg')

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