【摘要】 针对数字工程图的版权保护问题,提出了一种基于混沌的小波域数字水印方法,该方法通过从工程图中提取特定顶点构造出复值信号量再进行离散小波变换,通过对变换后的小波细节系数幅值进行调制嵌入一32×32像素的二值水印图像。为了加强水印信息的安全,采用复合混沌序列技术对原始水印图像进行了加密。实验结果证明这种方法对平移、旋转、缩放、镜像以及添加或删除部分实体攻击具有良好的鲁棒性。更多还原

【Abstract】 A digital watermarking method is proposed for 2-dimensional engineering drawings.The vertices coordinate pairs of the 2d engineering drawings are extracted to construct correspondent complex signal which is in turn transformed by discrete wavelet transformation.By modifying the detail coefficients,a 32×32 pixels bi-value watermark image is embedded into the 2d engineering drawings.We encrypted the original watermark bi-value image by compound chaotic sequence.The experimental results show that the proposed algorithm is robust to the attack of rotation,translation,scaling,mirroring and entities addition and deletion.更多还原