A New Copyright Protection Scheme with Visual Cryptography

This paper proposes a new efficient and secure copyright protection scheme for digital watermarking by using visual cryptography technique. The proposed scheme has the following merits compare with previous related schemes: (1) The proposed scheme uses simple codebook to generate a watermarked image. (2) The proposed scheme does not need to expand the watermark image. (3) The proposed scheme eliminates two security problems on the previous Lou et al.'s scheme which that the problem of stability of relationship between discrete wavelet transform (DWT) coefficients and the problem of ambiguity of watermark verification. As a result, the proposed scheme is more efficient and secure compare with previous related schemes.