基于提升方案小波的半脆弱水印图像认证算法

Semi-fragile image watermarking authentication scheme based on lifting scheme wavelet

在小波变换域内,将水印嵌入在特定的小波系数中,对图像带来的失真影响很小,同时可以准确地检测和篡改定位,因此目前实现认证的脆弱水印和半脆弱水印大多在小波域内。提出了一种使用提升小波变换的半脆弱水印方法。在原始宿主图像经过提升小波变换之后的低频子带,根据水印和小波系数的特征自适应地修改小波系数,嵌入过程实现了很好的不可见性和鲁棒性,实现了盲提取,并能准确地实现篡改的检测和定位。

Fragile watermarking and semi-fragile are the efficient way to solve the image authentication. Since in the wavelet transform embedding watermarking to the specify coefficients of the transformed wavelet will bring less distortions and can locate the tamper area accurately, there are many ways of fragile and semi-fragile watermarking wavelet transform. The proposed scheme is processed in liftwavelet transform. According to the watermarking and the features of the wavelet coefficients, watermark is adaptively embedded to the low frequency coefficients of the lift-wavelet transform to ensure the invisibility and the robustness of the watermarking. At the same time, in the extract process, original image is not needed, that is blind-extracting, and the tampered area is located accurately.