关键词: 数字水印, 人类视觉系统, 版权保护, 内容认证

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