how do I descrambling for the scrambling code explain in below:

Question

hayat ali 2018-11-24

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431741-how-do-i-descrambling-for-the-scrambling-code-explain-in-below

评论： Devisha Tiwari 2021-4-16

origin=imread('lena.bmp');
        imshow(origin)
        title('Image Loaded')
temp=origin;
n=length(temp) 
N=3000; % no of iterartions
m=0;
a=20;
b=10;
c=a*b+1;
flag=0;
while flag==0
    for i=0:n-1                       
        for j=0:n-1
            x=mod(i+a*j,n); 
            y=mod(b*i+c*j,n); 
            lastimage(x+1,y+1)=temp(i+1,j+1);
        end
    end
    m=m+1;
   if(mod(m,4)==0)
        figure,imshow(lastimage)
        title('Scrambled Image')
        flag=flag+1;
   else
      temp=lastimage;
    end
end

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Devisha Tiwari 2021-4-16

The code above performs Arnold's cat map on the lena image.

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Answer 1

Image Analyst 2018-11-24

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431741-how-do-i-descrambling-for-the-scrambling-code-explain-in-below#answer_348710

arnolds_cat_map.m

It looks like you're trying to do Arnold's cat map: Wikipedia Arnold's cat map

See wikipedia and my attached demo, which has LOTS of comments to explain it.

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hayat ali 2018-11-27

Image Analyst

thank you very much.

I just want steps that reflect the previous code steps. can you help me to get it?

Image Analyst 2018-11-27

Not sure what you want to get. The previous code steps will of course "reflect" the previous code steps. In fact, they are identical. I don't know what steps to tell you to take. Do you mean

highlight the code,
type control-c, then
go somewhere where you want to paste it, and
type control-v?

Those steps?

Please format your code as code so that people can easily copy it to the clipboard. Then no one has to mess with highlighting and typing control-c, we can just click the copy link.

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