【摘要】 提出了一种将GRAY码用于水印结构设计的混沌加密数字图像水印算法。首先通过混沌序列将水印信息加密,再使用GRAY码进一步置乱弱化水印信息,然后利用人类视觉模型特性,将置乱信号自适应地加入到彩色载体图像蓝色分量离散余弦变换域的低频分量系数中。实验表明,该算法对于抵抗各种噪声、滤波和压缩等攻击具有很好的鲁棒性以及安全性。更多还原

【Abstract】 This paper presents a new robust watermarking scheme for color image using GRAY code and chaotic encryption. A binary watermark image is permutated using sequence numbers generated by a secret key in a spatiotemporal chaos system. Then, the binary image watermark was encoded by Gray code regarded as an unit ,and then adaptively embedded into low frequency components of the original color image’s blue channel in discrete cosine transform domain. Experimental results show that this scheme show that the proposed scheme is robust and secure against a wide range of image processing operations such as adding noise, filtering and lossy compression.更多还原