Help me with for loop

Hi, I have a matrix A with size 32*32 and I need to study the similarity between all pixels.

The similairty between a pixel Xi and another pixel Xj in the neighbourhood of Xi is detemine by an exponantially decaying fuction of the squared difference in thier intensity values:

Sij = exp (-a (I(Xi) - I(Xj))^2); 
    % where a is a scale (a = 30) and I(x) is denotes the intensity of pixel x .

I need to study the similarity between pixel in location (1,1) with the ather pixels and recored the values of simialrity in matrix A1, so matrix A1 will has a size 32*32.

the value of A1(1,1) is the similarity between pixel A(1,1) with pixel A(1,1) ,

the value of A1(1,2) is the similarity bwtween pixel A(1,1) with pixel A(1,2) ,

and so on.

Thanks ♥

Answer 1

[David Hill]

a=.1;
B=exp(-a*(A-A(1,1)).^2);%comparing all pixels to A(1,1)

[Mohammad Alwardat]

Thank you so much ♥

[Mohammad Alwardat]

David, how can I use for loop to compare all pixels togathers?

so I will get 32*32 similarity matrix.

[David Hill]

Not sure what you mean. In the above example, B is a 32x32 matrix that compares all pixels to A(1,1).

[Mohammad Alwardat]

We compared pixel A(1,1) with all pixels and recoreded the result in B matrix.

Now, I need to compare pixels A(1,2) with all pixels and recored the result in matrix B1

and compare pixels A(1,3) with all pixels and recored the result in matrix B2

.

.

and up to compare pixels A(32,32) with all pixels and recored the result in matrix B1023

so, I will get 32*32 = 1024 similarity matrix.

did you understand what I mean?