一种抗JPEG压缩的数字图像水印算法

A digital image watermarking algorithm resisting JPEG compression

提出了一种新的图像水印算法,通过对图像进行分块DCT变换,并对分块变换后的DC直流系数值进行分段修改来嵌入水印。在嵌入前对原始水印进行Arnold置乱加密,增强其抵抗攻击的能力。实验结果表明,用该方法嵌入的水印容量大、透明性好,可以较好地抵抗剪切、噪声攻击,尤其是对JPEG压缩具有良好的鲁棒性。

A novel image watermarking algorithm was proposed. Through the way of discrete cosine transformation to the image piecemeal, the DC coefficient in subsections was altered to insert the watermark. In order to boost up its resisting power, the original watermark was scrambled by Arnold-scrambling algorithm. Experimental results show that this algorithm has good robust performance, which is robust against different kinds of attacks, such as image cropping, noise-adding and JPEG compression.