数字水印在图像传输中的应用

Application of Digital Watermark in Image Transmission

为了保障图像在传输过程中版权所有者的利益,提出基于离散小波变换(DWT)的数字水印算法。该算法中将水印信息进行Arnold置乱,对载体图像进行二级离散小波变换,并将置乱后的水印信息嵌入到二级低频系数中得到含水印的载体图像。水印提取是水印嵌入的逆过程,该算法支持水印盲提取。仿真实验结果表明,算法具有较好隐蔽性,而且能抵抗常规的水印攻击,具有较好的鲁棒性。

In order to protect the interests of copyright owners in the process of image transmission,this paper proposes a digital watermark algorithm based on discrete wavelet transform (DWT).In this algorithm,after the watermark information is Arnold scrambled,the carrier image is carried out two-level discrete wavelet transform,and the scrambled watermark information is embedded into two-level low-frequency coefficients to obtain the carrier image with watermark.Watermark extraction is the inverse process of watermark embedding.The algorithm supports blind watermark extraction.Simulation results show that the algorithm has good concealment,can resist conventional watermark attacks and has good robustness.