小波变换域数字图像监视水印算法

利用图像小波变换系数的特点,提出了一种监视水印嵌入方法,用于在选择认证中推断作品经受的失真操作,其中低频监视水印信号由图像的半脆弱签名产生,而高频和中频监视水印信号为利用混沌序列生成的二值序列,水印的嵌入位置由密钥决定,具有非常好的安全性;水印的提取不需要原始图像.实验表明:该方法嵌入的水印不可见性好,能成功地推断出JPEG压缩、低通滤波、高通滤波等常见的图像失真操作.

Digital Image Monitor Watermarking Algorithm in DWT Domain

A digital image monitor watermarking algorithm is presented based on the characteristic of DWT coefficient.The low-frequency monitor watermark is a semi-fragile signature of image,the high-frequency and mid-frequency monitor watermark is a binary sequences based on chaotic sequences,and use key to determine the position of watermark in the image,which can assure very good security for the watermark.The watermark is extracted without the origial unmarked image.The experiments show that the algorithm can assure good imperceptibility for watermarked image and the watermark embedded using the algorithm can conclude the familiar attacks such as JPEG,lowpass and highpass filter,and beseem to selective authenticate for image.