一种可抵抗局部几何攻击的多比特水印算法

Multi-bit Watermark Algorithm Resisting Local Geometric Attacks

该文提出一种新的可抵抗局部几何攻击多比特水印算法,算法采用快速相关攻击技术进行解码。水印的二进制比特序列作为初态输入到线性反馈移位寄存器中,输出序列嵌入到三角形中,三角形根据尺度空间的Harris特征点检测器和Delaunay三角剖分得到。提取时依靠相关攻击强有力的纠错性能,恢复出隐藏在嵌入区域中的水印。试验表明:该算法对旋转缩放平移、剪切、甚至StirMark中的随意变形攻击以及JPEG压缩、滤波等都具有强鲁棒性。

A novel local geometrical invariant multi-bit watermark algorithm based on decoding using fast correlation attacks is proposed in this paper. The binary bit sequences of watermark as the initial state are fed into the linear feedback shift register, and the output sequence is embedded into the triangles which are obtained according to the scale-space Harris feature points and Delaunay tessellations. During the extraction, the embedded watermark is extracted according to the fast correlation attacks technique which has powerful error-correcting capacity. Simulation results show that the proposed algorithm is highly robust against various attacks including rotation scaling translation, cropping, even random bending attack in StirMark, JPEG compression and filtering and so on.