Simple watermarking by using wavelets: W=watdet3(watermarkim,originalim); - File Exchange

Code covered by the BSD License

from Simple watermarking by using wavelets by Mustafa UCAK
Simple image watermarking in wavelet domain

W=watdet3(watermarkim,originalim);
function W=watdet3(watermarkim,originalim); a=marked-image1; [ca ch cv cd]=dwt2(a,'db1'); imshow(ca);