透视变换

%透视变换
i=imread('cameraman.tif');
udata=[0 1];
vdata=[0 1];
tform=maketform('projective',[0 0; 1 0; 1 1;0 1],...
                                [-4 2;-8 -3;-3 -5;6 3]);
[b,xd,yd]=imtransform(i,tform,'bicubic',...
                            'udata',udata,...
                            'vdata',vdata,...
                            'size',size(i),...
                            'fill',128);
subplot(1,2,1),imshow(udata,vdata,i),axis on;
subplot(1,2,2),imshow(udata,vdata,b),axis on;