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T1 = maketform('affine',[2 0 0; 0 1 0; 0 0 1]);%ºáÏò·Å2±¶¡£Èç¹ûÏëËõ2±¶¾Í°Ñ2¸ÄΪ0.5¼´¿É£¬¼´±äΪ0.5±¶
T2 = maketform('affine',[1 0 0; 0 2 0; 0 0 1]);%×ÝÏò·Å2±¶¡£Èç¹ûÏëËõ2±¶¾Í°Ñ2¸ÄΪ0.5¼´¿É£¬¼´±äΪ0.5±¶
T3 = maketform('affine',[4/5 0 0; 0 3/5 0; 0 0 1]);%ºáÏò4/5£¬×ÝÏò3/5
I = imread('cameraman.tif');
I1 = imtransform(I,T1);
I2 = imtransform(I,T2);
I3 = imtransform(I,T3);
imshow(I), figure, imshow(I1), figure, imshow(I2), figure, imshow(I3)
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B = imresize(A, scale, 'bilinear')
B = imresize(A, [mrows ncols], 'bilinear')

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