How to display second level dwt?
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Hi. I want to display second level dwt. If I display seperatly to frequency components, it works fine. But when I try to merge and display, It appears just black color. Here is my code
close all;
clear;
cd 'C:\Users\LENOVO\OneDrive\Masaüstü' %% Uploading picture to Matlab
X=imread('Coleen.jpg','jpg');%Reading picture by Matlab
[LoD,HiD] = wfilters('haar','d');
[cA,cH,cV,cD] = dwt2(X,LoD,HiD,'mode','symh');
[cA2,cH2,cV2,cD2]=dwt2(cA,LoD,HiD,'mode','symh');
subplot(2,2,1)
imagesc(cA)
colormap gray
title('Approximation')
subplot(2,2,2)
imagesc(cH)
colormap gray
title('Horizontal')
subplot(2,2,3)
imagesc(cV)
colormap gray
title('Vertical')
subplot(2,2,4)
imagesc(cD)
colormap gray
title('Diagonal')
figure
Level2=[cA2,cH2; cV2,cD2];
imagesc([Level2,cH; cV,cD]);
colormap gray
It appears like this. But I want to display it like below.
Please. Could you help me?
采纳的回答
yes，sir，may be use the dimension information，such as
close all;
clear all; clc;
%Reading picture by Matlab
X=imread('cameraman.tif');
[LoD,HiD] = wfilters('haar','d');
[cA,cH,cV,cD] = dwt2(X,LoD,HiD,'mode','symh');
[cA2,cH2,cV2,cD2]=dwt2(cA,LoD,HiD,'mode','symh');
figure
Level2=[mat2gray(cA2),mat2gray(cH2); mat2gray(cV2),mat2gray(cD2)];
d = [Level2,mat2gray(cH); mat2gray(cV),mat2gray(cD)];
% get dimension
rects1 = [1 1 size(cA2)
1 2 size(cA2)
2 1 size(cV2)
2 2 size(cD2)];
rects2 = [1 1 size(Level2)
1 2 size(cH)
2 1 size(cV)
2 2 size(cD)];
rects = {rects1, rects2};
imagesc(d);
colormap gray
axis equal
axis off
hold on;
rectangle('position', [1 1 size(d,2)-1 size(d,1)-1], 'EdgeColor', 'y', 'LineWidth', 2)
for k = 1 : length(rects)
rectsk = rects{k};
for i = 1 : size(rectsk, 1)
recti = [zeros(1, 2) rectsk(i,3:4)];
% get location
rowi = rectsk(i,1);
coli = rectsk(i,2);
for j = 1 : coli-1
recti(1) = recti(1) + rectsk(j, 4);
end
for j = 1 : rowi-1
recti(2) = recti(2) + rectsk(j, 3);
end
rectangle('position', recti, 'EdgeColor', 'y', 'LineWidth', 2)
end
end
1 个评论
Imtiyaz Ahmad
2023-8-7
Hi,
Dimensions of arrays being concatenated are not consistent.... but its working fine while using haar wavelet, can you provide the solution for that also ..
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