A blind watermarking algorithm based on Joseph Ring and DCT is presented. The algorithm has high security and the conceal effect is very good for using Joseph ring to scramble the watermark image. The robustness is improved because of watermarking embedment and extraction using DCT, and the parity of quantitative value is checked at the same time. These lead to the watermark capacity increasing. The emulation experiment indicates the algorithm has high efficiency, security and robustness for attack of compression, median filtering, Gaussian noise, etc.%提出了基于约瑟夫环和DCT系数的盲水印算法.该算法首先使用约瑟夫环对水印信息进行置乱,使水印不可见性及抗攻击能力增强,再利用DCT系数量化,及对量化值进行奇偶性检验,实现了水印的嵌入及提取.增加了水印容量,从而提高了算法的鲁棒性.结果表明,该算法对压缩、中值滤波、高斯噪声等攻击,具有很好的鲁棒性,并且安全性强.
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