一种基于非均值量化系数特征不变的盲数字水印方案

BLIND DIGITAL WATERMARKING SCHEME BASED ON NON-MEAN QUANTISATION PARAMETER WITH INVARIANT FEATURES

针对商品包装图像在水印检测过程中图像会发生变形的问题展开研究,提出一种基于非均值量化系数特征不变的盲数字水印方案。该方案利用第二代数字水印的概念,采用了量化水印技术,通过图像内容的重要系数特征进行水印的提取,解决了商品包装图像在图像发生弯曲变形的情况下水印的检测问题。实验结果表明,该方法在保证水印的不可见性的同时,具有较大水印容量,在商品有较大角度偏转和位移的情况仍能正确提取,对于常见的图像旋转、平移、剪切和扭曲等攻击具有鲁棒性。

In view of the problem that the pictures on commodities packaging may have distortion in watermark detection process,studies are carried out and a new blind digital watermark algorithm is proposed.The scheme is based on non-mean quantisation parameters with invariant features,it utilises the concept of the 2nd generation digital watermarking and uses the technique of quantisation watermarking.The algorithm resolves the problem of watermarking detection of commodities packaging pictures in the circumstance of images having bending distortion.The experimental results indicate that the algorithm has bigger watermark capacity when ensuring watermark imperceptibility,and when the commodities undergo a swerve in big angle or shift in position,it is still able to extract the watermark correctly,and is robust against normal attacks including image rotation,translation,shearing and distortion.