现在时间是：
17074167-作业7
作者：胡恰、刘婷宜、王爽、陈晨 发布时间：2019-05-21 17:37:33 浏览次数：161I=imread('tets','jpg')
imshow(I);
%quasternion representation
[m,n]=size(I(:,:,1));
A0=zeros(m,n);
A1=double(I(:,:,1));
A2=double(I(:,:,2));
A3=double(I(:,:,3));
A=[A0 A2 A1 A3];
%svd ??
k=1; 只取一列？
Uk=U(:,[1:k n+1:n+k 2*n+1:2*n+k 3*n+1:3*n+k])
Vk=V(:,[1:k n+1:n+k 2*n+1:2*n+k 3*n+1:3*n+k])
Sk=[s(1:k,1:k) zeros(k,k) zeros(k,k) zeros(k,k)];
Qk=timesQ(timesQ(Uk,Sk),transq(Vk));%Qk=UkSkVk*;
Rk=Qk(:,2*n+1:3*n);
Gk=Qk(:,n+1:2*n);
Bk=Qk(:,3*n+1:4*n)
Ik(:,:,1)=Rk;Ik(:,:,2)=Gk;
Ik(:,:,3)=Bk;figuer imshores(Ik)
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