一种小波包域图像自适应水印算法

为了解决日益严重的盗版问题,提出了一种基于小波包变换的自适应水印算法。对宿主图像进行小波包分解,对水印图像进行小波分解。根据视觉感知特性将水印的低频分量自适应地嵌入到宿主图像的低频分量中,嵌入强度根据图像的内容自适应地决定。水印的中高频分量用位置自适应的方法嵌入到图像的中高频分量中。嵌入过程中充分利用Hilbert扫描曲线的良好特性。实验结果表明,该算法对常见的图像处理操作具有较强的鲁棒性。

Adaptive Image Watermarking Algorithm Based on Wavelet Packet Transform

In order to solve the increasingly serious problem of piracy,the paper presents an adaptive image watermarking algorithm based on wavelet packet transform.The algorithm processes the original image through wavelet packet transform,the watermark through wavelet transform,and then embeds the LF component of the watermark into the LF component of the original image based on human visual characteristics,in the process of which the embedding strategy is adaptively determined by the original image content.The IF and HF components of the watermark are embedded into the IF and HF components of the original image in location adaptive mode.In the process of embedding,the algorithm takes full advantage of Hilbert scanning.The experimental results show that the algorithm is very robust to common image processing.