基于VCS和DCT的数字水印技术
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摘要
基于可视密码方案(VCS)和离散余弦变换(DCT),提出了一种彩色图像的数字水印算法。将要保护的水印图像利用可视密码方案(VCS)生成两张分享图像,其中一张分享图像利用DCT算法嵌入彩色图像,另一张受版权保护。若要恢复原始水印图像,需采用逆DCT方法提取分享图像并和另一张分享图像叠加。该方案易于实现,具有很高的可行性。此外,该方案提高了数字水印的鲁棒性。
A novel digital watermarking algorithm of color image based on VCS(Visual Cryptography) and DCT(Discrete Cosine Transform) is proposed. The protected watermark generates two shares by with visual cryptography, and with DCT algorithm, one of the shares is embedded into a color image and another is protected by the copyright. To restore the original watermark image, it is necessary to extract the shared image by with inverse DCT algorithm and overlay it with another shared image. The scheme is easy to implement and highly feasible. In addition, the embedding capacity and robustness of the digital watermark is effectively improved.
A novel digital watermarking algorithm of color image based on VCS(Visual Cryptography) and DCT(Discrete Cosine Transform) is proposed. The protected watermark generates two shares by with visual cryptography, and with DCT algorithm, one of the shares is embedded into a color image and another is protected by the copyright. To restore the original watermark image, it is necessary to extract the shared image by with inverse DCT algorithm and overlay it with another shared image. The scheme is easy to implement and highly feasible. In addition, the embedding capacity and robustness of the digital watermark is effectively improved.
引文
[1]Ruanaidh Q J,Bowling W J,Boland F M.Watermarking Digital Images for Copyright Protection.IEEE proceeding on Vision[J].Signal and Image Proce-ssing,1996,143(04):250-256.
[2]Zhu Y,Zou W,Zhu X S.Collusion Secure Convolution Fingerprinting Information Codes[C].Proceedings of the lst ACM Symposium on Information,Computer and Communication Security,2006:266-274.
[3]Barni M,Bartolini F.Data Hiding for Fighting Piracy[J].IEEE Signal Processing Magazines,2004,21(02):28-39.
[4]Shamir A.How to share a secret[C].Commun.ACM 22,1979:612-613.
[5]Naor M,Shamir A.Visual Cryptography[C].Advances in Cryptography:EUROCRYPT,1995:1-12.
[6]Tuyls P,Hollmann H D L,Vanlint J H.XOR-based Visual Cryptography Schemes[C].Designs,Codes and Cryptography,2005:169-186.
[2]Zhu Y,Zou W,Zhu X S.Collusion Secure Convolution Fingerprinting Information Codes[C].Proceedings of the lst ACM Symposium on Information,Computer and Communication Security,2006:266-274.
[3]Barni M,Bartolini F.Data Hiding for Fighting Piracy[J].IEEE Signal Processing Magazines,2004,21(02):28-39.
[4]Shamir A.How to share a secret[C].Commun.ACM 22,1979:612-613.
[5]Naor M,Shamir A.Visual Cryptography[C].Advances in Cryptography:EUROCRYPT,1995:1-12.
[6]Tuyls P,Hollmann H D L,Vanlint J H.XOR-based Visual Cryptography Schemes[C].Designs,Codes and Cryptography,2005:169-186.