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Kindly Explain the shuffled procedure and how this code shuffle the pixel values?

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Wajid
Wajid 2022-12-19
回答： Image Analyst 2022-12-19
A=[1 2 3 4 ; 5 6 7 8; 9 10 11 12; 13 14 15 16];
disp('Given Matrix is');
disp(double(A));
%/////////////////////////////////////////////////
[m,n]=size(A);
a = 3;
b = 3;
num_iter = 5;
for k=1:num_iter
for i=1:m
for j=1:n
r = mod([round((1-(a*(i^2))+j)),round((b*i))],[m n]);
S(i,j)=A(r(1)+1,r(2)+1);
end
end
A=S;
end
disp('Shuffled matrixx is');
disp(double(S));
%//////////////////////////////////////////
%%Reshuflle Imge
[m,n]=size(S_img);
a = 3;
b = 3;
num_iter = 5;
for k=1:num_iter
for i=1:m
for j=1:n
r1 = mod([round((1-(a*(i^2))+j)),round((b*i))],[m n]);
x1(r1(1)+1,r1(2)+1)=S_img(i,j);
%x(i,j)=x1(r(1)+1,r(2)+1);
end
end
S_img=x1;
end
disp('shuffled matrix is ');
disp(double(x1));

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采纳的回答

Image Analyst
Image Analyst 2022-12-19
I'm pretty sure that's the algorithm for Arnolds Cat Map:
https://en.wikipedia.org/wiki/Arnold%27s_cat_map
Attached is my demo.

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