【摘要】 在DCT域数字水印算法的基础上,提出了DC系数奇偶量化的盲水印算法。该算法结合JPEG压缩标准,将水印信号隐藏在经过量化后的DC值奇偶性中,在保证水印对于JPEG压缩的鲁棒性的同时,实现了水印的盲提取。同时,水印嵌入前做Arnold置乱预处理,以增强其对于图像剪裁的鲁棒性。此外,预处理时加入的密钥又进一步提高了算法的安全性。实验证明,该算法对于压缩、剪裁、加噪声等具有较好的鲁棒性,尤其对于JPEG压缩,压缩比为29时还可以达到较好的提取效果。更多还原

【Abstract】 A blind watermarking algorithm is proposed in the paper.Based on Discrete Cosine Transform(DCT) domain,the binary signals are embedded in the DC coefficients by means of parity quantization.Arnold transform is used to enhance the robustness and the security of watermarks.Experiment shows the robustness of the algorithm towards compression,clipping and noise,especially JPEG compression.Better extraction effect can be attained even when compression ratio is up to 29.更多还原