How to apply walsh hadamard transform?

Please help me with the code to implement the walsh hadamard transform on an image. I am not aware how to apply the transform on a 256*256 lena image.

Answer 1

[Sufiyan]

Hi,

You can refer to the code below to apply Hadamard transform on the image.

% Load the PNG image
img = imread('img.jpg');
img = double(img);

% Resize the image to 256x256
lena = imresize(lena, [256,256]);

% Compute the Walsh-Hadamard Transform
wht = hadamard(256) .* lena .* hadamard(256)';
wht = wht / sqrt(256*256);

% Display the results
subplot(1,2,1);
imshow(uint8(lena));
title('Original Image');
subplot(1,2,2);
imshow(log(1+abs(wht)), []);
title('Walsh-Hadamard Transform');

You can refer to the hadamard(256) documentation to get more information about the function.

Hope this helps!