how can embed on dwt decomposed image?

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Rezaur Rahman 2015-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/257868-how-can-embed-on-dwt-decomposed-image

编辑： Geoff Hayes 2015-11-27

i've only decomposed my cover img. bt cant failing to code for embedding. i can reconstruct the img, only need to embed with watermark img.. plz hlp...

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img  = imread('home.jpg'); %input image 
img  = rgb2gray(img);      %Convert to grayscale image
figure,imshow(uint8(img)),title('Cover Image');
img  = double(img);
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('haar'); %to Obtain fiters associated with haar
[ca,ch,cv,cd] = dwt2(img,Lo_D,Hi_D);     %Compute 2D wavelet transform
y = [ca ch;cv cd];
figure,imshow(uint8(y)),title('dwt imag');