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Hi every one is there any way how to subtradt two matrices of different dimension let say A=<424x544x3uint8> and B=<462x545x3 uint8> How can we perform subtraction like S=A-B. Thanks

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sachin
sachin on 22 Oct 2014
Answered: Andy on 22 Oct 2014
A=imread('u.png'); B=imread('c2.png'); Ip = imabsdiff(A,B); imshow(Ip)

Answers (1)

Andy
Andy on 22 Oct 2014
How about expanding the two inputs to generate matrices with matching dimensions, assuming A(1,1) lines up with B(1,1)
Asize=size(A);
Bsize=size(B);
Csize=max(Asize,Bsize);
Anew=zeros(Csize);
Bnew=zeros(Csize);
Anew(1:Asize(1),1:Asize(1,2))=A;
Bnew(1:Bsize(1),1:Bsize(1,2))=B;
S=Anew-Bnew;
Alternatively trim them to the same size after finding the size of the overlap,
Asize=size(A);
Bsize=size(B);
Csize=min(Asize,Bsize);
Anew=A(1:Asize(1),1:Asize(1,2));
Bnew=B(1:Asize(1),1:Bsize(1,2));
S=Anew-Bnew;

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