Abstract: Copyright Protection and Image Authentication are two primary functions of digital watermarking.But watermarking schemas which have achieved these two functions simultaneously are not very good.A new watermarking schema is proposed，which embeds fragile watermark and robust watermark into different color components of the color image for copyright protection and image authentication.The experiments show that the algorithm can assure good imperceptibility for watermarked image，the watermark embedded for copyright protection is robustness to JPEG compress，Gaussian noise and so on，and the watermark embedded for content authentication cannot only characterize attract but also localize the modifications made to the image effectively.

Key words: digital watermarking, HVS, copyright protection, content authentication

摘要： 实现版权保护和内容认证是数字水印的两个最主要功能，而现有同时实现这两个功能的数字水印方案并不完美。提出了结合人类视觉系统在图像的绿色分量中嵌入版权信息，实现版权保护，在蓝色分量中嵌入二值图像，实现内容认证。实验证明该方法透明性好，版权保护水印对JPEG压缩、高斯噪声等攻击抵抗力强，内容认证水印能有效地刻画攻击和定位篡改。

关键词: 数字水印, 人类视觉系统, 版权保护, 内容认证