finding maximum abs value of four images

Question

Mahua Nandy(Pal) 2013-3-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67455-finding-maximum-abs-value-of-four-images

I have four 16x16 images.I want to form another image by taking the maximum abs value of all four values of a particular pixel e.g. by comparing I1(3,3),I2(3,3),I3(3,3) and I4(3,3),I will be getting I5(3,3).

my piece of code is:

for k:4
.......
figure,imshow(B);
    s=size(B)
   eval(sprintf('im_%d=B;',k));
end

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Jan 2013-3-16

在 MATLAB Online 中打开

Avoid using EVAL to hide an index in the name of a variable. It is much easier, nicer and more efficient to use an index as index:

im = cell(1, 4);
for k = 1:4
  ...
  im{k} = B;
end

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Answer 1

Matt Kindig 2013-3-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67455-finding-maximum-abs-value-of-four-images#answer_78869

在 MATLAB Online 中打开

No loops necessary:

CombinedImages = cat(3, I1, I2, I3, I4)
I5 = max(abs(CombinedImages),[],3)

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Mahua Nandy(Pal) 2013-3-17

thanks a lot

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Answer 2

Azzi Abdelmalek 2013-3-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67455-finding-maximum-abs-value-of-four-images#answer_78865

在 MATLAB Online 中打开

[n,m]=size(im1);
for k=1:n
    for p=1:m
       v=[im1(k,p) im2(k,p) im3(k,p) im4(k,p)];
       [~,idx]=max(abs(v));
       im(k,p)=v(idx);
    end
end