Can anyone provide me the Matlab code for image encryption -decryption using Scan Pattern?

Certainly! Here's an example MATLAB code for image encryption-decryption using the Scan Pattern algorithm:

```matlab

% Image Encryption-Decryption using Scan Pattern

% Encrypt function

function encryptedImage = encryptImage(originalImage, key)

[rows, cols] = size(originalImage);

encryptedImage = zeros(rows, cols);

scanPattern = generateScanPattern(rows, cols, key);

for i = 1:rows

for j = 1:cols

encryptedImage(scanPattern(i, j)) = originalImage(i, j);

end

end

end

% Decrypt function

function decryptedImage = decryptImage(encryptedImage, key)

[rows, cols] = size(encryptedImage);

decryptedImage = zeros(rows, cols);

scanPattern = generateScanPattern(rows, cols, key);

for i = 1:rows

for j = 1:cols

decryptedImage(i, j) = encryptedImage(scanPattern(i, j));

end

end

end

% Generate Scan Pattern function

function scanPattern = generateScanPattern(rows, cols, key)

rng(key); % Set the random number generator seed

scanPattern = reshape(1:(rows*cols), rows, cols);

scanPattern = scanPattern(randperm(rows), :);

end

% Usage example

originalImage = imread('input_image.png'); % Replace with the path to your input image

key = 123; % Replace with your desired encryption key

encryptedImage = encryptImage(originalImage, key);

decryptedImage = decryptImage(encryptedImage, key);

imwrite(uint8(encryptedImage), 'encrypted_image.png'); % Save the encrypted image

imwrite(uint8(decryptedImage), 'decrypted_image.png'); % Save the decrypted image

```

This code defines three functions: `encryptImage`, `decryptImage`, and `generateScanPattern`. The `encryptImage` function takes an original image and a key as input, generates a scan pattern based on the key, and encrypts the image using the scan pattern. Similarly, the `decryptImage` function takes an encrypted image and the same key, generates the scan pattern, and decrypts the image. The `generateScanPattern` function creates a random scan pattern based on the provided key. You can replace `'input_image.png'` with the path to your own input image and adjust the key as needed. The encrypted and decrypted images are saved as `encrypted_image.png` and `decrypted_image.png`, respectively.