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: In Image steganography why secret image converted into black & white before embidding
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