基于四元数的双彩色图像盲水印算法

Blind Watermarking Algorithm Based on Quaternion for Double Color Image

提出一种基于四元数的双彩色图像盲水印算法。对载体图像和水印图像分别进行离散四元数傅里叶变换后,对水印图像频域的低频、中频和高频系数做混沌置乱处理,并利用脉冲编码调制方法,在载体图像的低频、中频和高频嵌入置乱后水印的相应频带系数,通过逆离散四元数傅里叶变换得到嵌入水印的图像。实验结果表明,该算法保证水印具有较高的透明性,对剪切、叠加噪声、JPEG压缩等常见的攻击具有较好的鲁棒性。

This paper proposes a blind watermarking algorithm for double color image based on quaternion.Frequency matirx of the host image and watermark image are gained by using quaternion Fourier transform,and low frequency,middle frequency and high frequency are scrambled by the chaotic sequences.The scrambled watermark is embedded in low frequency,middle frequency and high frequency of host image by using Pulse Code Modulation（PCM）.The watermarked host image are gained by using inverse Discrete Quaternion Fourier Transform（DQFT）.Experimental results show that the algorithm has the property of perceptual transparency,and is robust to common image attacks,such as cropping image,noise,JPEG compression and so on.