si = double(handles.si);alpha = 0.05;for i = 1:4:size(LL3,1) for j = 1:4:size(LL3,2); block = LL3(i:i+3,j:j+3); block1 = si(i:i+3,j:j+3); emb(i:i+3,j:j+3) = ((1-alpha)*block)+(alpha*block1); endendaxes(handles.axes5);imshow(emb,[]);title('emb image');% IDWT
out3 = idwt2(emb,LH3,HL3,HH3,'haar');out2 = idwt2(out3,LH2,HL2,HH2,'haar');out1 = idwt2(out2,LH1,HL1,HH1,'haar');axes(handles.axes5);imshow(out1,[]);title('Stego G panel image');handles.out1 = out1;% Update handles structure
guidata(hObject, handles);helpdlg('Process completed');
MATLAB: The project related to steganography using 3 level discrete wavelet transform. mery question is that what is the size of secret image before and after embedding? is there any loss of data during extraction.i am converting jpg image to bw with64*64
dwtsteganography
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