【摘要】 提出了一种在DCT域中给图像加水印的方法 .该方法合理综合了几种数字水印技术 ,利用DCT域的视觉掩蔽特性 ,在图像的不同部分嵌入不同强度的经过伪随机扩展编码后的水印 ,且提取水印时无需原图像 .结果表明 ,在保证水印不可视的前提下 ,该方法提高了水印的鲁棒性 ,并对JPEG压缩、中值滤波等攻击具有很好的抵抗能力 .更多还原

【Abstract】 It is given a new digital watermarking algorithm in DCT domain. The algorithm utilizes the visual masking in DCT domain to embed pseudo\|randomly coded watermarks in different image parts with different intensity, Which improve the robust of watermarking and keep it invisible. Experimental results show that the algorithm can extract watermark without original image and stand against several attacks,such as JPEG compression,etc.更多还原