can i get the matlab code for scrambling a digital image based on arnold transformations??

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sumaya 2014-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/122907-can-i-get-the-matlab-code-for-scrambling-a-digital-image-based-on-arnold-transformations

评论： Image Analyst 2024-1-31

clc;
clear all;
close all;
A = imread('cameraman.tif');
imshow(A);
N=256;
T=1.4938*N+40.8689;
disp(T);
t=0;
T2=ceil(T);
disp(T2);
c=[T];
iscram=A;
while t<T2
    for i=[0:N-1]
        for j=[0:N-1]
            iscram(i,j)=iscram(mod(i+j,N),mod(i+(2*j),N));
        end
    end
    t=t+1;
end
     figure,imshow(imscram);

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mamoona 2024-1-31

hey! do you have the matlab code for image scrambling and unscrambling using arnold cat map? i am working on colored images.

Image Analyst 2024-1-31

@mamoona, yes I do. Did you look at my answer below? The code is attached.

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采纳的回答

Image Analyst 2014-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/122907-can-i-get-the-matlab-code-for-scrambling-a-digital-image-based-on-arnold-transformations#answer_159918

编辑：Image Analyst 2016-12-30

arnolds_cat_map.m

I don't really know what this code is doing or if I'm even doing it correctly, but here's a version of the code that "works": [OLD CODE DELETED]

[EDIT] - See vastly improved working code in my comment further down, and also attached here.

This code is working only those images which are in image toolbox but if we put an image like LEENA or Baboon it shows an error that N which is N> maxallowablesize is unrecognized variable. Anybody can help me bcz we have to test our encryption result on Baboon, Leena, Camerman because they are general image. So please help me what do I change in my code after sending Lena's picture to that Image toolboox folder.

Image Analyst 2022-10-20

@Vivek You forgot to attach your image! Probably because you've never see posting guidelines:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

I'll check back later for your image that the code throws an error for.

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更多回答（1 个）

Manpreet 2015-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/122907-can-i-get-the-matlab-code-for-scrambling-a-digital-image-based-on-arnold-transformations#answer_177470

I am doing a project on Image watermarking using Discrete Wavelet Transform(DWT) and Encryption. It is carried out in the following steps 1.) Select the host image( Image in which watermark will be hided). 2.) Select the watermark. 3.) Encrypt the watermark using the following code as given by sir(Image analyst) 4.) Watermarking using DWT.

5.) Recover the Encrypted watermark using recovery formula.

6.) Decryption of watermark using the following code which is also attached. This is also given by Image Analyst

My Question is that I have made many attacks on Watermarked Image like Rotation, Scaling, Croping but PSNR and MSE between (Watermark and Decrypted watermark) after and before attack remain Infinity and Zero respectively.

I think During Decryption, I have used same ran permutation that I used to ENCRYPT the image. So I think, Attacks have no effect on decrypted image.

Question is how to improve my code or what suggestions you can give me.

I need Help. Though, I am trying but yr valuable suggestions can make code more effective and fast

Thanks............