基于纠错编码的小波域自适应盲水印算法

提出了一种小波域自适应盲水印算法,并采用(7,4)汉明码技术进行纠错编码。以伪随机二值序列作为水印,采用中值系数抖动的方法将水印嵌入到小波变换后的低频分量,并且根据小波域系数间隔的大小自适应地确定水印量化步长,水印检测过程不需要原始图像的参与。实验结果表明,算法的自适应性强,具有较好的不可见性,且可以有效地抵抗JPEG压缩、锐化、加噪、模糊和缩放等攻击。

An Adaptive Blind Watermarking Algorithm in Wavelet Domain Based on Error Correction Code

An adaptive watermarking algorithm in wavelet domain is proposed and the hamming code is used to correct the wrong code.The watermark is composed of binary sequence and is embedded into the low-frequency band of the wavelet image representation by changing the median value.The quantization step is determined adaptively in accord with the interval of the wavelet coefficients.The watermark can be detected without resorting to the original host image.The experimental results show that the algorithm proposed has the following characters: adaptability,invisibility and robustness against attacks such as JPEG compression,sharpening,additive noise,blur and scaling.