Question

matlab如何将图片按一边固定尺寸进行等比缩放

Answer 1

imo=imread('test.png');%读取
s=2;%缩放倍数，缩放后与原始大小的比值
figure(1)
imshow(imo);%原图显示
[m n d]=size(imo);
if s<=1 & s>0
for i=1:d
im(:,:,i)=imo(round(1:1/s:m),round(1:1/s:n),i);
end
elseif s>1
[X Y]=meshgrid(1:n,1:m);
[Xt Yt]=meshgrid(1:1/s:n,1:1/s:m);
for i=1:d
im(:,:,i)=interp2(double(imo(:,:,i)),Xt,Yt,'spline');
end
if isa(imo,'uint8')
im=uint8(im);
else
im=uint16(im);
end
end
figure(2)
imshow(im);%缩放图显示