How to apply walsh hadamard transform?

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Sneha 2018-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/377237-how-to-apply-walsh-hadamard-transform

回答： Sufiyan 2023-4-25

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.

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Answer 1

Sufiyan 2023-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/377237-how-to-apply-walsh-hadamard-transform#answer_1222609

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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');