【摘要】 提出一种用于矢量图形的数字水印方法 该方法将矢量图形中图元的顶点坐标有顺序地排成一维序列 ,通过离散小波变换将序列分解成不同空间和频率上的复值系数 ,并根据水印的大小与小波系数之间的关系把水印嵌入到小波系数的幅值中 ,系数的相位不变 该算法在提取水印时不需要原始矢量图形 实验证明该算法具有良好的不可见性和较强的鲁棒性更多还原

【Abstract】 A vector graphics authentication technique by embedding digital watermarks is proposed. The vertices coordinate pairs of the vector objects are generated by mapping a 2-D graphics into a sequence. We embed the watermarks into the vector graphics by modifying the DWT magnitude coefficients according to the watermark value, and leaving the angle coefficients unchanged. The experimental results show that the proposed technique successfully survives vector graphical processing operations.更多还原