基于图像压缩量化系数的自适应水印算法

Self-adaptive Digital Watermarking Algorithm Based on Quantizing Coefficients in Image Compression

提出了一种基于图像压缩系数量化的自适应数字图像水印算法。该算法利用图像压缩中量化系数的特性,在其中嵌入水印。为增强水印的安全性用LFSR将置乱后的二值水印图像量化嵌入到载体图像的系数中,水印检测过程不需要原始图像的参与。实验结果表明,该算法不仅具有良好的不可见性,而且对常见攻击如JPEG压缩、噪声、滤波和几何攻击等具有较强的稳健性。

A watermark embedding and extracting method for quantizing coefficients in Image compression is proposed. It uses the characteristics of scalar quantize. In the embedding process, a Linear Feedback Shift Register （LFSR） is used to hide the watermark information and the watermark positions. The watermark can be extracted without resorting the original image. The experimental results show that the proposed method satisfies enough imperceptibility and robustness for common attacks such as JPEG compression, adding noise, low-oass filtering, and geometric distortion.