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急求MATAB程序,插值算法放大图像

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急求MATAB程序,插值算法放大图像
系数:h1(n)={1/2,1/2}
h2(n)={-1,5,5,-1} 2的3次方=8
h3(n)={1,-5,20,20,-5,1} 2的5次方=32
function x = doublem(a)
[height,width] = size(a);
temp = uint8(zeros(height*2,width*2));
for i =height*2:-2:1
for j =1:2:width*2
temp(i,j) =a(i/2,(j+1)/2);
end
end
for i =height*2:-2:1 %列转换
for j =2:2:width*2-1 %512*511
temp(i,j) =(temp(i,j-1)/2+temp(i,j+1)/2);
end
end
for j =1:1:width*2-1 %行转换
for i =height*2-1:-2:2
temp(i,j) =(temp(i-1,j)/2+temp(i+1,j)/2);
end
end
x = temp;
return;