一种小波域隔点嵌入数字水印算法

本文提出了一种基于小波域数字水印算法,算法选择在图像中相间隔位置的象素点作小波变换,再利用低频细节子带部分的三个系数之和的特点嵌入水印,水印嵌入时每个系数均只需作非常小的修正,测试结果证明该算法有效保证了水印的不可见性,同时对JPEG压缩、噪声、模糊及锐化等常见的图像处理具有较强的鲁棒性。

A Wavelet-Domain Watermark Algorithm Based on Separated Embedding

This paper has proposed a digital watermark algorithm in wavelet domain. With this method, the original image is decomposed by wavelet transform in separated position, a bit of watermark information is embedded by the characteristic of the sum of three coefficients, each coefficient only needs small modify when embedding watermark. Experimental results show that the watermark is invisible and has high robustness to common image processing operation such as JPEG compressing, noise, smoothing and sharpening etc.