How to make third level haar transformation on an image in matlab

Question

I have problem how to make third level on an image in Matlab. I use this code:

image=imread('image.jpeg');
wavename = 'haar';
[cA,cH,cV,cD] = dwt2(im2double(image),wavename); %first level 
[cAA,cAH,cAV,cAD] = dwt2(cA,wavename); % Recompute Wavelet of Approximation Coefs.
Level2=[cAA,cAH; cAV,cAD]; %contacinat and second level
imshow([Level2,cH; cV,cD],'Colormap',gray);

[cAAA,cAAH,cAAV,cAAD] = dwt2(cAA,wavename); % Recompute Wavelet of Approximation Coefs.
Level3=[cAAA,cAAH;cAAV,cAAD]; %contacinat
imshow([Level3, cAH; cAV,cAD],'Colormap',gray); %3 level

But the program says that there is an error in the last row. The error is "CAT arguments dimensions are not consistent." So the question is how can i make this code to work?

Where is the error. Please, always provide full information. — Ander Biguri, Apr 02 '18 at 08:31
imshow([Level3, cAH; cAV,cAD],'Colormap',gray); %3 level In this row is the error! The program says that 'CAT arguments dimensions are not consistent" — Milena Bundeva, Apr 02 '18 at 09:47
And they are not, are they. Check the sizes of each of those variables. — Ander Biguri, Apr 02 '18 at 09:55
They are not, but i don't know how to check them and correct them. — Milena Bundeva, Apr 02 '18 at 09:56

score 0 · Answer 1 · answered Apr 02 '18 at 10:08

0

This is caused by your image, I assume.

The following code works properly, no changes made but the image

image=imread('cameraman.tif');
wavename = 'haar';
[cA,cH,cV,cD] = dwt2(im2double(image),wavename); %first level 
[cAA,cAH,cAV,cAD] = dwt2(cA,wavename); % Recompute Wavelet of Approximation Coefs.
Level2=[cAA,cAH; cAV,cAD]; %contacinat and second level
imshow([Level2,cH; cV,cD],'Colormap',gray);
figure
[cAAA,cAAH,cAAV,cAAD] = dwt2(cAA,wavename); % Recompute Wavelet of Approximation Coefs.
Level3=[cAAA,cAAH;cAAV,cAAD]; %contacinat
imshow([Level3, cAH; cAV,cAD],'Colormap',gray); %3 level

answered Apr 02 '18 at 10:08

Ander Biguri

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Hello! I've tried this code but it's not what i want. The result is only the second level of haar transformation and it doesn't include the third level :( – Milena Bundeva Apr 10 '18 at 10:15
@MilenaBundeva this is the code you provided, I did not change anything................... – Ander Biguri Apr 10 '18 at 10:29
Yes, i know that – Milena Bundeva Apr 10 '18 at 11:06
@MilenaBundeva So... you provided code that you wanted help with, but actually it was not the code you wanted? Also, you may need to rethink you variable names, as if `Level3` is not the third level, well, it has a terrible name – Ander Biguri Apr 10 '18 at 11:10
Yes, I want some help how to make with my code third level of haar transformation. – Milena Bundeva Apr 10 '18 at 11:27

How to make third level haar transformation on an image in matlab

1 Answers1