基于最大水纹叠加与尺度缩放的图像数字水印算法

Image Digital WatermarkingAlgorithm Based on Maximum Wave Superposition and Scale

为了解决当前图像水印算法在面对嵌入水纹容量较大时,其不可见性较差的不足,论文设计了基于最大水纹叠加尺度缩放的图像数字水纹嵌入与提取算法。首先,基于最低位像素修改的LSB嵌入算子,嵌入初步水纹信息;然后变换图像到离散余弦域DCT,将剩余水纹叠加到幅值最大处,设计了水纹完整嵌入机制;最后,将含水纹图像进行缩放攻击后,再提取水纹。实验数据显示:与当前图像水印算法相比,在面对水纹嵌入容量较大时,论文算法拥有更高安全性,具有较强的不可见性与抗攻击性。

In order to solve the defect such as poor invisibility of the current image watermarking algorithm in the face of embedding large watermark capacity, in this paper, digital image watermark embedding and extracting algorithm based on maximum wave superposition and scale is proposed. First, based on the low pixel modified LSB embedding operator, preliminary watermark information is imbedded, then image is transformed to discrete cosine domain, the remaining watermark superimposes to the maximum, the watermark embed complete mechanism is designed, finally, the watermarked image conducts scaling attack, and then extracts the watermark. The experimental data show that compared with the current image watermarking algorithm, in the face of watermark embedding capacity is large, the algorithm in this paper has higher security, strong invisibility and anti-attack.