一种基于频域变换的图像盲水印算法

针对当前日益严重的数字多媒体作品侵权问题，基于最新版权保护的数字水印技术，提出了一种基于图像特征的盲水印算法。首先利用原始图像的边缘特征确定了分块对应的水印强度因子；然后通过在分块Hadamard变换域中修改中频系数来嵌入水印。实验结果表明，盲水印算法对常用的图像处理（如JPEG压缩、加噪、剪切和滤波等）攻击具有较好的鲁棒性，在数字作品的版权保护领域具有一定的应用价值。

A blind image watermarking method based on frequency domain transform

Aiming at the deepening infringement of intellectual property rights of digital works, a blind image algorithm based on characteristic of image was proposed, by means of the new digital watermarking technique for protecting intellectual property. With the edge detection algorithm, the watermark＇s intensity factors of blocks was decided and watermark was inserted by modifying the blocked Hadamard transform middle frequency coefficients. The research results show that the proposed method has very strong ability of sustaining on common image processing operations such as JPEG compression, noise adding, clipping and filtering, and has well practicality in the image digital production copyright protection area.