Decomposition of Image using dyadic wavelet transform

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Nishtha Parashar 2015-6-5

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https://ww2.mathworks.cn/matlabcentral/answers/222658-decomposition-of-image-using-dyadic-wavelet-transform

回答： Prasanna 2024-10-22

Hii, Can some one help me in providing code for decomposition of image using dyadic wavelet transform into LL and HH subbands.

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Answer 1

Prasanna 2024-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/222658-decomposition-of-image-using-dyadic-wavelet-transform#answer_1535420

在 MATLAB Online 中打开

Hi Nishtha,

Decomposition of image into LL and HH subbands can be done using the ‘dwt2’ function present in MATLAB. To perform the decomposition you can perform the following steps:

Load the image.
Convert the image to grayscale.
Perform wavelet decomposition.
Extract the LL and HH sub bands from the decomposition.

Below is a MATLAB example on how to perform a 2D wavelet decomposition using the ‘dwt2’ function. 

% load the image and convert it to grayscale 
image = imread('cameraman.tif'); 
grayImage = im2gray(image) 
% perform wavelet decomposition using the dwt2 function 
[LL1,LH1,HL1,HH1]=dwt2(grayImage,'db1'); 
[LL2,LH2,HL2,HH2]=dwt2(LL1,'db1'); 
[LL3,LH3,HL3,HH3]=dwt2(LL2,'db1'); 
% Display the original image and the subbands 
figure; 
subplot(1, 3, 1); 
imshow(image); 
title('Original Image'); 
subplot(1, 3, 2); 
imshow(LL1, []); 
title('LL Subband'); 
subplot(1, 3, 3); 
imshow(HH1, []); 
title('HH Subband'); 