基于小波分析的自适应数字水印算法

An Adaptive Watermark Algorithm Based on Wavelet Transform

提出一种在小波变换域嵌入数字水印的新算法。利用视觉系统的纹理掩蔽及照度掩蔽特性 ,在第三级细节子图块的最大系数中嵌入水印信号。水印强度与图像背景亮度及纹理强度成正比 ,使水印对原始图像具有自适应性。对水印图像进行各种退化处理的实验表明 。

A novel algorithm of embedding digital watermark into wavelet transform domain is proposed. Utilizing the human visual texture masking and luminance masking models, watermark is embedded into the largest coefficient of third level detail subimage. The intensity of watermark is proportional to the intensity of texture and brightness of the image, which makes the watermark be adapted to the original image. The experiment results show that the digital watermark algorithm is robust enough to image degradation process.