MATLAB 图像放大/缩小，最邻近插值

cl;
w=0.6;              %放大或缩小的宽度
h=1.4;            %放大或缩小的高度
img=imread('Corner.png');
imshow(img);
[m n]=size(img);
imgn=zeros(h*m,w*n);

rot=[h 0 0;0 w 0;0 0 1];                                    %变换矩阵x=h*u,y=w*v
inv_rot=inv(rot);

for x=1:h*m
    for y=1:w*n
        pix=[x y 1]*inv_rot;                 
        imgn(x,y)=img(round(pix(1)),round(pix(2)));        
    end
end

figure,imshow(uint8(imgn))